I have an extra master cylinder which was the original one .. I replaced it maybe 20 years ago. I'm going to take it to this specialty shop in San Jose that I visited several years ago. They apparently rebuilt many masters (maybe brake masters) for Wilkinson that were new but from a Chinese vendor and needed help. I'll let them disassemble and evaluate. Maybe I'l luck out and only minor honing will clean up the bore if there is any rust.
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