I'm rebuilding an '83 300 TDT head and need to pull the prechambers. None of the local machine shops can do this. All the tools I've seen (IMPCO) cost a fortune. The threads look like 22mmx1.0mm pitch but I cannot find a bolt this size (surfed the web and local industrial bolt supplies). A machine shop gave me a $50 quote to cut these theads but I didn't see a furnace in the shop for post maching heat treatment. I've been told '75 to '86 Nissan cars use this pattern on their CV joints at the wheel hubs and I thought about welding this to a puller. Any ideas on where to find a bolt before I hit the junk yards?