Here is a source for roller bottom dies: RVP65-2 - Rolla-V - Rolleri S.p.A.This part is fascinating! Never knew that.
During late teens, i spent time in an old Danish machinist's shop. (Same man who introduced me to EAA) I was oohing and aahing over the machines one day and he said WTTE "Son, the machines don't mean anything without tooling. Best machine in the world is useless without good accessories and tooling to facilitate the work.
I learned the machine shop side from a retired Canadian Army sergeant with no fewer than 5 trades tickets, but my go-to guy later was a old Dane who made his mark rebuilding machine tools. Talented beyond belief and could do incredible precision work with the simplest of machine tools (all rebuilt by him, of course). When he retired, I was out of town, but my wife got to his sale and bought a milling machine for me to have a piece of history. Sadly, sale was at a super lull in economy and I doubt he got 10 cents on the dollar for what his stuff was worth. Had I been there I would have come home with several things. Modern CNC stuff can do some marvellous things, but the skills to repair the mechanical stuff are few and far between.