This is a recent tool that I made to engage with the 'notches' in CAT40 tooling to allow me to unscrew the 'Pull Studs' for re-use in other tooling. I have a CAT40 tightening fixture but to remove the pull studs the holder needs to be inverted and the fixture won't accommodate that.
I've been gripping the CAT40 flanges in soft jaws in the vice, which isn't very nice, but I was also motivated as a chap on eBay is selling some obviously ex Beaver tooling as it has the propriety special pull studs, and although he is prepared to sell me the studs can't get them unscrewed. So I may have to make a site visit!
(You cannot buy the pull studs)
CNC Plasmacut from 6 mm mild steel, two off welded together to make the required thickness and a bit of hand fettling.
. . . works OK on the bench.