I made my cap maker out of 4140 prehard if i remember right. Wasnt too hard to make if you have a lathe. I was actually impressed with how it came out and how it works. I might have just got lucky on my measurements when i made it but it works really good. I think a guy could make one with a good drill press and the right sized bolts and lots of emery cloth to get every thing dialed in. It might be crude but i bet you could do it.