{"product_id":"used-project-x-evenflow-black-driver-shaft-stiff-flex-graphite-44-in-callaway-opti-fit-adapter","title":"Used Project X EvenFlow Black Driver Shaft Stiff Flex Graphite - 44 in - Callaway Opti-Fit Adapter","description":"\u003cstyle\u003e\n\/* Force a real 2-column grid on THIS list only, overriding the theme *\/\n#product-desc-list{\n  display:grid !important;\n  grid-template-columns:1fr 1fr;\n  gap:0;\n  list-style:none;\n  margin:0 0 16px 0;\n  padding:0;\n  column-count:initial !important; \/* kill multi-column layout *\/\n}\n#product-desc-list \u003e li{\n  margin:0 !important;\n  padding:6px !important;\n  border-bottom:1px solid #d9d9d9 !important;\n  float:none !important;          \/* kill float layouts *\/\n  width:auto !important;          \/* kill width:50% rules *\/\n}\n#product-desc-list \u003e li._left { border-right:1px solid #d9d9d9 !important; }\n\u003c\/style\u003e\n\n\u003cul id=\"product-desc-list\" style=\"visibility:hidden\"\u003e\n    \u003cli\u003e\n\u003cb\u003eShaft Condition:\u003c\/b\u003e Mint\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eBrand:\u003c\/b\u003e Project X\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eModel:\u003c\/b\u003e EvenFlow Black Driver\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eClub Type:\u003c\/b\u003e Driver\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eShaft Flex:\u003c\/b\u003e Stiff\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eShaft Material:\u003c\/b\u003e Graphite\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eShaft Weight:\u003c\/b\u003e 65g\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eTip Diameter:\u003c\/b\u003e .335\u003c\/li\u003e\n\u003cli\u003e\n  \u003cb\u003eAdapter Type:\u003c\/b\u003e \n  \u003ca href=\"https:\/\/s3.us-east-1.amazonaws.com\/nrg.productimages\/Shaft+Adapter+Types.png\" target=\"_blank\" style=\"color: #ff5000; text-decoration: underline; cursor: pointer;\"\u003e\n    Callaway Opti-Fit Adapter\n  \u003c\/a\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eLength:\u003c\/b\u003e 44 in\u003c\/li\u003e\n    \u003cli\u003e\n\u003cb\u003eGrip Condition:\u003c\/b\u003e Average Wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript\u003e\n(function () {\n  const ul = document.getElementById('product-desc-list');\n  if (!ul) return;\n\n  function pruneAndLayout(){\n    \/\/ Remove empty\/unspecified rows instead of hiding them\n    const items = Array.from(ul.querySelectorAll('li'));\n    let kept = [];\n    items.forEach(li =\u003e {\n      const label = li.querySelector('b');\n      const labelText = label ? label.textContent : '';\n      const valueOnly = label\n        ? li.textContent.replace(labelText, '').trim()\n        : li.textContent.trim();\n\n      const emptyish =\n        valueOnly === '' ||\n        valueOnly === '°' ||\n        \/^(Not Specified|Unspecified|Not Applicable|N\\\/A|NA)$\/i.test(valueOnly);\n\n      if (emptyish) li.remove();\n      else kept.push(li);\n    });\n\n    \/\/ Re-mark visible items as left\/right cells so borders line up\n    kept = Array.from(ul.querySelectorAll('li')); \/\/ in case we removed some\n    kept.forEach((li, i) =\u003e {\n      li.classList.toggle('_left',  i % 2 === 0);\n      li.classList.toggle('_right', i % 2 === 1);\n    });\n\n    \/\/ If odd count, add a blank cell so the last row closes cleanly\n    if (kept.length % 2 === 1) {\n      const filler = document.createElement('li');\n      filler.innerHTML = '';\n      ul.appendChild(filler);\n      filler.classList.add('_right');\n    }\n\n    \/\/ Show after we’re done so there’s no flash\n    ul.style.visibility = 'visible';\n  }\n\n  \/\/ Run immediately (before most theme scripts finish)\n  pruneAndLayout();\n\n  \/\/ Guard: if the theme reflows\/rewrites after our run, fix it again\n  const mo = new MutationObserver(() =\u003e pruneAndLayout());\n  mo.observe(ul, { childList: true, subtree: false, attributes: false });\n})();\n\u003c\/script\u003e\n\n\n\n\u003cstyle\u003e\n  \/*\n   * The theme duplicates the description for desktop tabs and\n   * mobile accordions. Hide empty copies and show every copy that\n   * actually contains a video iframe.\n   *\/\n  .nr-product-video {\n    display: none;\n    margin: 4px 0 32px;\n  }\n\n  .nr-product-video:has(iframe),\n  .nr-product-video.is-ready {\n    display: block !important;\n  }\n\n  .nr-product-video__title {\n    margin: 0 0 14px;\n    text-align: left;\n    color: inherit;\n    font-size: inherit;\n    font-weight: inherit;\n    line-height: inherit;\n  }\n\n  .nr-product-video__frame {\n    position: relative;\n    width: 100%;\n    max-width: 720px;\n    margin: 0;\n    overflow: hidden;\n    aspect-ratio: 16 \/ 9;\n    border-radius: 12px;\n    background: #000000;\n  }\n\n  .nr-product-video__frame iframe {\n    position: absolute !important;\n    inset: 0 !important;\n    display: block !important;\n    width: 100% !important;\n    height: 100% !important;\n    max-width: none !important;\n    margin: 0 !important;\n    padding: 0 !important;\n    border: 0 !important;\n  }\n\n  @media screen and (max-width: 749px) {\n    .nr-product-video {\n      margin: 4px 0 24px;\n    }\n\n    .nr-product-video__title {\n      margin-bottom: 12px;\n      font-size: inherit;\n    }\n\n    .nr-product-video__frame {\n      max-width: 100%;\n      border-radius: 10px;\n    }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"nr-desc\"\u003e\n  \u003cdiv class=\"section hide-if-empty\" data-val=\"The Project X EvenFlow Black Driver Shaft produces a penetrating, low-spin flight via its even-energy transfer design. A tip-stable, firmer profile suits aggressive transitions yet feels fluid through impact. Offered in tighter-torque, heavier weights, it pairs with faster swing speeds seeking flatter launch, tight shot dispersion, and stealthy, matte-black visuals.\"\u003e\n    The Project X EvenFlow Black Driver Shaft produces a penetrating, low-spin flight via its even-energy transfer design. A tip-stable, firmer profile suits aggressive transitions yet feels fluid through impact. Offered in tighter-torque, heavier weights, it pairs with faster swing speeds seeking flatter launch, tight shot dispersion, and stealthy, matte-black visuals.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"section hide-if-empty\" data-val=\"This shaft is in mint condition, showing no signs of wear or damage. It has been well-maintained and is ready for immediate use.\"\u003e\n    This shaft is in mint condition, showing no signs of wear or damage. It has been well-maintained and is ready for immediate use.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n\u003cdiv class=\"nr-product-video\"\u003e\n    \u003cdiv class=\"nr-product-video__title\"\u003e\n      \u003cb\u003e\u003cu\u003eClub Model Overview\u003c\/u\u003e\u003c\/b\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"nr-product-video__frame\"\u003e\n      \n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cstyle\u003e\n  .pured-shaft-section { display: none; }\n  .pured-shaft-section[data-pured^=\"Yes\" i] { display: block; }\n\u003c\/style\u003e\n\u003cdiv class=\"pured-shaft-section section\" data-pured=\"No\"\u003e\n  \u003cb\u003e\u003cu\u003ePured Shaft Upgrade\u003c\/u\u003e\u003c\/b\u003e\u003cbr\u003e\n  This shaft has been pured through computerized analysis to identify its most stable, consistent bending plane, optimizing performance, increasing distance, tightening dispersion, and reducing natural structural irregularities.\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\n  \u003cdiv class=\"section hide-if-empty\" data-val=\"Our Next Round Golf experts recommend the Project X EvenFlow Black Driver Shaft for aggressive swingers seeking a low-launch, low-spin profile with a stable feel. Its stiff, tip-stable design helps stronger players keep the ball down and tighten dispersion while still delivering a smooth load through transition.\"\u003e\n    \u003cb\u003e\u003cu\u003eOur Recommendation\u003c\/u\u003e\u003c\/b\u003e\u003cbr\u003e\n    Our Next Round Golf experts recommend the Project X EvenFlow Black Driver Shaft for aggressive swingers seeking a low-launch, low-spin profile with a stable feel. Its stiff, tip-stable design helps stronger players keep the ball down and tighten dispersion while still delivering a smooth load through transition.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"section hide-if-empty\" data-val=\"Project X shafts are engineered for precision and control, especially in irons and hybrids. Known for low launch and tight dispersion, Project X is a staple in tour bags and custom fittings.\"\u003e\n    \u003cb\u003e\u003cu\u003eAbout Project X\u003c\/u\u003e\u003c\/b\u003e\u003cbr\u003e\n    Project X shafts are engineered for precision and control, especially in irons and hybrids. Known for low launch and tight dispersion, Project X is a staple in tour bags and custom fittings.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"section\"\u003e\n    \u003cb\u003e\u003cu\u003ePlaying It Forward\u003c\/u\u003e\u003c\/b\u003e\u003cbr\u003e\n    By choosing this premium used shaft, you're not only investing in your own game but also contributing to Next Round Golf's mission of making golf more affordable and accessible for enthusiasts at every skill level. You’re joining a passionate community dedicated to sustainability, continuous improvement, and the shared joy of discovering new potential on the course.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"section\"\u003e\n    \u003cb\u003e\u003cu\u003eNext Round Guarantee\u003c\/u\u003e\u003c\/b\u003e\u003cbr\u003e\n    With over 18,000 five star reviews and a 30 day money back guarantee, you can trust Next Round Golf for high-quality used Project X golf shafts.\u003cbr\u003e\u003cbr\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"section\"\u003eStock # S2026-09-03-369079\u003c\/div\u003e\n  \u003cdiv class=\"section\"\u003eMaster SKU # 1021148\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cscript\u003e\n  (function () {\n    function normalizeYouTubeUrl(source) {\n      if (!source) {\n        return source;\n      }\n\n      try {\n        var url = new URL(source, window.location.href);\n        var hostname = url.hostname\n          .toLowerCase()\n          .replace(\/^www\\.\/, \"\");\n        var videoId = \"\";\n\n        if (hostname === \"youtu.be\") {\n          videoId =\n            url.pathname.split(\"\/\").filter(Boolean)[0] || \"\";\n        } else if (\n          hostname === \"youtube.com\" ||\n          hostname === \"m.youtube.com\" ||\n          hostname === \"music.youtube.com\" ||\n          hostname === \"youtube-nocookie.com\"\n        ) {\n          if (url.pathname.indexOf(\"\/embed\/\") === 0) {\n            videoId =\n              url.pathname.replace(\"\/embed\/\", \"\").split(\"\/\")[0];\n          } else if (url.pathname === \"\/watch\") {\n            videoId = url.searchParams.get(\"v\") || \"\";\n          } else if (url.pathname.indexOf(\"\/shorts\/\") === 0) {\n            videoId =\n              url.pathname.replace(\"\/shorts\/\", \"\").split(\"\/\")[0];\n          } else if (url.pathname.indexOf(\"\/live\/\") === 0) {\n            videoId =\n              url.pathname.replace(\"\/live\/\", \"\").split(\"\/\")[0];\n          }\n        }\n\n        if (\n          !videoId ||\n          !\/^[A-Za-z0-9_-]{6,}$\/.test(videoId)\n        ) {\n          return source;\n        }\n\n        var parameters = new URLSearchParams(url.search);\n        parameters.delete(\"v\");\n        parameters.set(\"playsinline\", \"1\");\n\n        var queryString = parameters.toString();\n\n        return (\n          \"https:\/\/www.youtube.com\/embed\/\" +\n          encodeURIComponent(videoId) +\n          (queryString ? \"?\" + queryString : \"\")\n        );\n      } catch (error) {\n        return source;\n      }\n    }\n\n    function prepareVideoBlock(videoBlock) {\n      if (\n        !videoBlock ||\n        videoBlock.getAttribute(\"data-nr-video-ready\") === \"true\"\n      ) {\n        return;\n      }\n\n      var videoFrame = videoBlock.querySelector(\n        \".nr-product-video__frame\"\n      );\n\n      if (!videoFrame) {\n        return;\n      }\n\n      var iframe = videoFrame.querySelector(\"iframe\");\n\n      \/*\n       * Empty copies remain hidden through CSS. 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