1/2" PVC to dumbbell conversion kit (lock jaw collar and inner collet)

thingiverse

Lock Jaw collar and inner collet for Half Inch PVC for use as a dumbbell. To create the lock jaw, you'll require: • Three M3x20mm bolts • Three M3 nuts • One 3mm diameter pin that is 20mm long (I used a scrap steel pin wrapped in tape to ensure a snug fit) • Duct tape or electrical tape for additional grip To create the pads, I utilized two small squares of double-layered duct tape. You can add more layers if you need extra clamping force. To assemble the inner collets, you'll need: • Two M4x15mm bolts • Two M4 nuts • Duct tape for added grip on the inner faces