[pianotech] Tight plastic flanges

[Joe Goss]

Hi David,
My thinking is that the plastic is continuing to cure and is growing causing the centers to tighten Best to both oil and
shrink the bushing.
Joe Goss BSMusEd MMusEd RPT
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: David Boyce 
  To: pianotech at ptg.org 
  Sent: Saturday, November 26, 2011 1:00 PM
  Subject: [pianotech] Tight plastic flanges


  Centres have become tight on the little Neindorf piano i tuned for a customer today.  

  It's a late 60s or early 70s piano with a "Pianic" action, and when I took out a hammer and the wippen/jack assembly for one note to check which centres were tight, happily the date was printed on that particular hammer, June 1969.  Jack centres are fine, but hammer flanges and wippen flanges tight.

  Since the flanges are plastic, what would be the more likely cause - swelling of the plastic flanges with age, or swelling of the centre pins? Would it be fair to assume that it's more likely to be the plastic flanges, since the jack centres were OK, and they are pinned the other way, with the bushed hole in the wood, not the plastic?

  Use of Protek CLP helped, making the action much less sluggish, and, basically, acceptable to play.  But it hasn't of itself gotten the centres as free as they should be.

  Best regards,

  David.
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