Very basic clamps for clamping the body of a cello. Holes for bottom half designed with 3/8" threads. Holes top half have no threads for the threaded rod to move freely through the holes.

The handle is a remix of a GoPro long knob threaded for 3/8" found here: http://www.thingiverse.com/thing:163883

You will need 3/8" threaded rods to complete these clamps.