Red, sorry about the situation, it gets frustrating.
I had a RM starter in 2007 when i built my engine. It worked/sounded o.k. for a few races. Ran the eng for warmup, then on class call, gear had come off, got a new Napa , started o.k., but gear had bent flexplate, hitting block. Expensive weekend !
No nose support at that time, and no rotating locking clamps, i got my money back, as i would not reinstall a starter with no nose support.
Don,t use RM without those two updates !
NAPA still in use.
67 Fairlane FE with 2" Hookers.
Try a stock starter before you damage something, then go from there with RM.