Someone is asking is 0.5mm is OK for piston clearance, how's that not technical?
OK, it's not a good technical question and the real answer is the upper limit of the service data (max undersized piston to max oversized bore) is 0.1mm.
Min clearance that should ever occur (upper limit on piston size, lower limit on bore size) is 0.039mm.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread