Guitar stand instrument retainer

Replacement for the retention strap that always breaks or gets lost. I find the times I don't clamp them in is when I knock them off the stand, usually wielding another instrument.

Fits a 3.5" fork distance, and ~5/8" diameter foam. Arm is offset to one side (vs. centered) to make it easier to print. Depth of the rotating collar is just to keep the arm straight as it locks to the other side.

EDIT: After having used this for a few months, I like it even better, and will be replacing my rubber straps with this thing. It can be easily operated with one hand, making getting the instrument out of the stand a lot easier.