Something like 10 years ago I bought 4 sets of rebuilt calipers from various sources - 128 & 850 fronts and 124 & scorpion rears. Before I put them into service, I want to disassemble them, make sure all is good and then put them back together. I also have a few pairs of used ones lying around that might be re-usable for someone or good to keep as spares. The bore for the e-brake rod in one of the used rear ones has what looks like a very tiny spot of corrosion. I think it needs to be honed. I took it to a machine shop who said they couldn't do it. Then I took it to a brake shop who said it "should be fine". I'd like to see it get honed. Is that ever done to these? If I wanted to do it myself, what type of hone to use? When I re-assemble the previously rebuilt calipers, what grease to use. I know not to use petroleum based grease or anti-seize compound but what type & brand of grease is recommended? I found that Krytox is highly regarded but it's not cheap. Permatex has a few versions of brake parts lube. Which one to use? I think there's one or two other brands that are popular. Should I be greasing the pistons/bores? I'm not sure if all brake greases can be used for that? Lastly, what to use to clean out the crusty dried out crud in the caliper piston groove for the seal? Is there anything that maybe can used to soak the calipers in to soften it up? Tried some brake cleaner and lacquer thinner but didn't do anything. The brake cleaner dries up way too fast to be useful anyway. Thanks!