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Wheelchair Axle Sleeve

These parts came from a wheelchair with a mismatched bearing inside diameter to axle diameter. The diameter of the axle is metric, exactly 12mm. The diameter of the bearing bore is 1/2inch or 12.7mm. The result was a lot of slop between the axle and the wheels. The solution was an accurately machined sleeve that would go from 12mm to 12.7mm.