how do they work? what yoyo would you use it for. Pics would help.

Shims look like this (the red piece):

They work in most YoYoJam plastics (Kickside, Lyn Fury, etc.) and hybrids (Dark Magic, Speeder, etc.), as well as in most of the SPYY D-bearing yoyos and others (though the D-bearing SPYYs require a different size shim than that you use in YYJs).

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See also:

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