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uxcell 4mm to 8mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Blue,2pcs: Amazon.com: Industrial & Scientific
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Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts - 80×10mm, White, 2-Pack
