Thanks for all the input; I spoke to the guys at PYI and they recommend to place the units on a stable platform and wet sand using 600 grit to remove the grooves and debris. They do not recommend machining but acknowledge that if done right it probably would work. Not surprisingly, they would prefer that you buy a new SS or carbon face.
I have ordered two rebuild
kits. The unit that is the oldest unit I will sand and remake with the kit. When I haul in several months, that unit will go on and the one just removed will be similarly treated, and held for replacement when needed.