[pianotech] Sealing pinblocks

[Qshooterq at aol.com]

This method was in vogue in the early 70's.   I fiberglassed two pinblocks 
even after a decent fitting.   One is still in very good shape after almost 
40 years.   The other I lost track of after 20 years. But was good at that 
time.
        ---Tom Gorley
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