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Tinkeriffic BB Bearing
A BB-based Tinkertoy-compatible bearing.Toys
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Like its predecessors, this Tinkertoy-compatible bearing system uses ten 4.5mm BB's to provide smoother rotation than the stock wheels included with a Tinkertoy set: http://bit.ly/1ngex61
The center bore is just a little loose on a Tinkertoy rod (not renowned for their precision diameters in the first place) so if you really need the bearing to stick fast I recommend using a little piece of painters' tape around the rod.
It's modeled in three parts for ease of assembly, but you'll need to super glue the two halves together.
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