I recently got some nice pieces of plumbing for free and I didn’t know what to do with them. Until I found that they may be good clamps, and because I’m in a lack of clamps anyway, it was worth a try. they are no particularly strong clamps but also really not the weakest. They operate very smoothly because of the fine threads but of course they are not the fastest.
Tools required to make them: Hacksaw, powerdrill, wood (jig)saw, file, rasp, hammer, chisel.