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.