| OK, wouldn't it make more sense for an amateur to start with a compound that is not abrasive at all? Because, if a valve is sticky because of corrosion or deposits on the cylinder wall then removing the foreign matter first before the metal would be preferable, wouldn't it?
I guess I'd try a mild, nonabrasive chemical varnish stripper first before lapping. Actually, I wouldn't, if it was a valuable horn I'd take it to a pro.
Greg
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