Made one Clamptite style tool as a gift for my father
Welded a solid bar to a 1/2" pipe and turned the tip of the tool in the lathe.
"milled" the slots with the pipe clamped to the QCTP.
M10 threaded bar and 5mm sping pins came from my bolts drawer.
A heavy spinning handle speed up the process of using the tool and I recomend you making something this way.