I had thought I replied but it may have gone poof, I dunno. We are trying to decide on flywheel material. I have lots of steel available, maybe some brass/bronze but probably not enough to do all of them. If I do steel I am looking into a friend who does nickel plating to see if that might be a feasible option. Enough brass from McMaster Carr will be about 650 so that's a little steep. I think aluminum might be a little light for a hit and miss, they need the mass to carry them thru. Anyone have any thoughts or suggestions?