Modern Robotics Axle Collar
thingiverse
A replacement for axle collars that fits 4mm D-shafts from Modern Robotics kits perfectly. Just insert a nut into the slot and use a screw to tighten it securely. Modern Robotics Axle Collars: http://www.modernroboticsinc.com/axle-collar-service-pack-60-0024
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