Just started demilling mine, debating if I'm brave enough to fit the barrel myself. Watched that video a half dozen times appreciate the content fellow Florida man!
The bullet guide rivet head is... what, 12? 13mm? An inch thick piece of mild steel divoted with a ball mill would be perfect to handle that for one or two builds. I'm honestly surprised no one has come out with adapters for the existing AKM tool sets yet
Pete, you didn't mention is the bolt was hitting the bullet guide. Did you have to Dremel the bullet guide to eliminate the interference with the bolt?