flywheel / ring gear Q...

[hardtimes]

I have an aluminum flywheel (Stipe) that is balanced with pressure plate and the steel face plate. I just put a ring gear on this flywheel.
Two questions: -since ring gear is pretty uniform in structure, must the whole flywheel be rebalanced ?

Also, I'm concerned about this ring gear staying put on the alum flywheel in the long run, because of dissimilar metals (expansion/contraction, etc). Anyone think that this situation should be 'pegged/staked' and just how is that accomplished...machinist