Who has a solution to stop the corroding of metal valve stems caused
by today's tanning process on leather nuts?  I am seeing more valve
stems corroded by the leather than ever on pianos rebuilt during the
last 20 years or so.  Even the ones rebuilt recently have this
corrosion.

I have started using nuts made of nylon.  I have tried soaking leather
nuts in shellac or lacquer but that doesn't seem to stop the problem.

Don Teach
Shreveport, Louisiana