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uxcell Flat Knurled Nut - M5 x 16mm x 5mm Thumb Nuts Lock Adjusting Nuts Aluminum Alloy Silver 10Pcs: Amazon.com: Industrial & Scientific
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2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for 3D Printer/DIY Encoder and Servo Stepped Motor: Amazon.com: Industrial & Scientific