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Amazon.com: uxcell Shaft Coupler 3mm x 5mm Connector Adapter for RC Airplane Boat Motor L20XD9 : Toys & Games
Amazon.com: Steel 3.175mm (1/8 inch) to 5mm Pinion Reducer Sleeve Adapter Shaft Motor Axle Change-Over for Converting RC Motor 3650 550 540 Pinion Gears, Set of 3 : Toys & Games
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Amazon.com: 3mm to 5mm Stainless Steel Set Screw Shaft Coupler : Industrial & Scientific