I built an holder for leather punch. Steel made, for 2mm rod professional type punch.
I applied a knurling for a better control on grip. The M4 grain block the tool in position and prevents slip.
I have to buy a new grain of correct size, in 5th picture I mounted one I had available only for test.
I not consider this a tool, but since I had to make a drawing for a friend, I decided to post here, maybe it can be an ispiration for someone