Morgan, I don't believe that the disk with the indexing slots is hardened. I removed mine and relieved it with a dremel. I'm certainly no machinist, but I'd think a machinist could do a much nicer job. You also will want to have a look at/replace the split pin because if it is deformed it makes it very tough to get the timing right. The whole indexing/timing setup on the Pro-Jector is the major flaw in it's design. Being a yankee at heart I think I'll stick with my current low primer warning system as the price was right
BD