Rotational to Linear Bracket
Description
This bracket can be used on either end of the gear, but may require some modifications to the gear's main rod where the end stops are located.
Instructions
This item becomes its own linear bearing when you insert BBs into the inner ring. There is a trick to putting all the bbs into the ring before putting the gear rod through.
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License
Rotational to Linear Bracket by moltenplastic is licensed under the Attribution - Share Alike - Creative Commons license.

To make the item a bearing; hold the shaft vertical, insert it into bracket, push shaft in until it barely begiens to cover the internal bearing ring, pour BBs into the bracket, push them into the bearing ring, when ring is full, push shaft all the way through. Excess BBs will pop out as you push the rod through.
Not as good as a purchased LM8UU, btu it works.
8-)