Sorry to bump this up but I have a question. Where do you not want to scratch the piston? I assume you don't want anything on lower half (body/walls) of the piston of course. But what about the lip and groove on the upper part. I scratched mine a little on the grove where the rubber seal goes. See pic.
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2011 Twin Turbo PW nismo #113 - My Journal - My TT Build Thread
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