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FPV Prop Roller Balancer With 624 Bearings
A propeller balancing stand for 5 mm-bore FPV and multirotor props up to 6 in (152 mm). Each upright holds a pair of 624 bearings (4 x 13 x 5 mm) on M4 screws, set one per face with 11 mm between centres so they overlap into a low-friction V. A 5 mm steel arbor rod through the prop rolls in that V until the heavy blade swings to the bottom. The arbor sits 82 mm above the base. The 110 x 60 mm footprint has a groove along one edge to park the rod.
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