Spool Clamp

A super simple thing that I was surprised wasn't already here.

Spool clamps are used by luthiers to build violins and other stringed instruments. Typically they're made from a hardwood dowel with a threaded rod trilled through the center, with cork or leather lining the jaws. They're great for clamping the edge of things without having to worry about the orientation of the clamp.

They cost about $4 each at a luthier supplier, which doesn't seem too much but you really need a couple dozen