[pianotech] hammer flange verdigris

[David Nereson]

 You can temporarily free them up with engine starter fluid, but it won't be 
a permanent solution.  ("Like mildew, it will return.")
    Has anyone ever figured out what the exact chemical reaction is between 
the bushing felt additives and the center pin plating, or exactly what 
verdigris is, chemically?
    --David Nereson, RPT

Hello list:

  I am rebushing a set of Steinway hammer flanges that have significant 
green / black verdigris. Hammers had 1/2 to two swings on the typical swing 
test.  My question is about the flange / birdseye.  Is there a good way to 
flush the birdseye to get the verdigris out, and what solution would one use 
??
    Thanks..... I'll contingue my bushing and wait for a reply.
    Dave McKibben