If the piano is designed well, you should be able to use thin balance rail punchings to get correct key height. As you remark to compression, I would always use a thin cloth punching and thicker card punchings to raise key height. David I. > -----Original Message----- > From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf > Of Farrell > Sent: Thursday, November 16, 2000 8:00 AM > To: pianotech@ptg.org > Subject: Balance Rail Felt Punching Theory > > > 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 > >
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