That's right, Cliff. The modification doesn't require sophisticated equipment..just need to relieve the diameter (couple of threads) by about .03 per side. When I set the press up, I was feeling a bump however the collet was actuating properly as best I could tell..had me stumped for a minute but it didn't take me long to see what was going on.
One must be careful of this however, the die itself is surprisingly dead soft so the threads should give against the plate whether it's Hornady or, Dillon if one pushes it a bit (bad practice). If I had to guess, the die's made of 12L14 low carbon steel which has some lead added to the mix for machinability. (that stuff is dead soft and machines like butter giving a great surface finish as cut)
now to find a carbine..