Roller cam thrust

What would be the difference between the nylon and the solid aluminum button? The Diamond is prefured?
You said "Othe route" which would be? Sorry, I missed it.

by other route i was referring back to the alum or nylon. the nylon is a little easier then the aluminum to grind down. but i don't see a real benefit to either. i've used both with no issues. the Diamond is nice but like i said its not really meant to work under a stock cover. the last couple of big blocks i've built i just used the nylon.