Balance Rail Felt Punching Theory

[Farrell]

Hi List. I have been victim to "Balance Rail Felt Punching Compression"
disease. Why are there 5 thicknesses available? Seems to me the thicker ones
will compress more over time, resulting in all the familiar problems of
shallow dip and mid-keyboard trough. Why not just always use the thin felts
and just use an appropriately thick cardboard punching to make up the
difference when the original was a thicker felt punching? What are the
advantages/disadvantages in doing this?

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com