Mason AA key end felts

[Tom Sivak]

List
   
  In the process of rebuilding a Mason and Hamlin AA, I now have to replace the key end felts.  As I was removing the old ones, I noticed that the bass section had thinner felts than the rest of the piano.  I never noticed this before on any other piano, but then, I didn't really notice it on this piano until I started razorblading them off.  
   
  Is this standard procedure?  I know the strings are a higher in the bass section, but the blow distance and the key dip is the same, so what purpose could there be behind having thinner key end felts in that section?  
   
  It looks to me as if they are original felts.  I wouldn't be replacing them if they weren't so worn out to begin with.  (Big dents in the felt; some bigger than others; I was unable to get an even damper lift from the keys even though they lifted evenly from the damper lever.)
   
  Thanks in advance,
  Tom Sivak
  Chicago
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