I have found that on some uprights the spoons have dug holes in the
lifter felt. The symptom of sluggish keys didn't go away until I found
that the spoons had a coating of something the same color as the lifter
felt (usually green). Using a water based cleaner on a slender piece of
cloth (shoeshine style), I was able to remove the residue from the
spoons. Kind of a trick to get the cloth between the spoons and damper
levers. Then spray the spoons with your favorite lube. Of course,
replacement of the felt would be best. FWIW.
Paul McCloud
San Diego
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