The factory grips on my 37 are just a teensy bit too thick at the left ear to let me easily use Safariland speedloaders. Is there a method of thinning them down and touching them up that keeps them looking mostly unaltered without having to do a total refinish?

McGuires scratch x20. will bring down the clear finish,while leaving it shiney and not flat like other compounds.

That's auto shop stuff, right? Thanks!

yes its used to buff clear coat auto finishes.Also works great on smart phone screens.