Got an old Holley carburetor that's developed a vacuum leak or has a throttle shaft that sticks or wobbles? Worn out throttle shaft bushings are usually the culprit. This JET 1001 kit is the fix. It comes with 16 high-quality bronze bushings – way more than you'll need for most carbs, so you have spares. The best part? It includes a reamer tool. You use the reamer to clean up and properly size the worn holes in the carburetor body so the new bushings press in perfectly, restoring that tight, like-new tolerance. This eliminates common problems like vacuum leaks (which cause rough idle and poor performance) and binding or sticking throttle plates. Instructions are included to guide you through the process. It's a pro-level repair that breathes new life into an old carburetor, making it run smoother and more responsive. A must-have for any classic car, muscle car, or hot rod enthusiast doing a carb rebuild.