I think the pre 85 had a metal and red plastic insert for a wad guide. After they used a one piece black plastic wad guide. I'm not sure what you mean by " knockout bushing". Is it the cam crimp punch that goes in the cam crimp housing ? I have an extra old Grabber 87 in 12ga that I'm converting to 10ga. Disconnected the resizer. Then ground out the shell carrier to take 10ga. Put on the start crimp and final crimp stations [10ga] from my 600jr. So far it works up to the start crimp station but still binds a bit when indexing to the start crimp station. I'll have to take it apart again and grind a bit more clearence on the base - the old machines had the outer guide cast in the base instesd of riveting on a piece of sheet metal. A 650 would have been easier but I didn't have one. If you look at a 600jr and a 650 you'll see they used the same drop tubes, start crimp and final crimp equipment. So far I can use the progressive action up to crimping and then I can pull the shell out and roll crimp. I get the rest working and then I can star crimp. Paul
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