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Re: Four-bar joints
Instead of purchasing bearings or nylon, you could glue in some pieces of PVC pipe. It's not quite as low friction as nylon, but with enough grease it should work!
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My religion is physics, it can explain everything.

WINNER -- 2011 Waterford District
District Chairman's -- 2011 Waterford District
Finalist -- 2011 Ann Arbor District
State Chairman's -- 2011 Michigan State Championship
Quarter-finalist -- 2011 Galileo
2011 Championship -- Highest Ranking Score
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