These bearings are absolutely necessary for the durability of the above trackball and should be purchased together with it. If other people you know want that trackball, you can save them the hassle of buying bearings because you'll have enough to replace them in two more trackballs. Just be aware that they can easily get lost, so be careful when taking them out of your bag and setting them up. It's recommended to use a microfiber cloth to keep them from rolling on the work surface, and you MUST use tape to hold these spare bearings in place when you reassemble the trackball. With everything secured you should see the bearings stay in place after removing the tape. You save yourself a lot of frustration and time.
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