jack not returning on high treble

[Alan R. Barnard]

The jacks (jack spring pushing spoon pushing wippen) can help hammers return. 
Your treble hammers are on their own. 
Possibles, in approximate order of desperation: Weak springs, crud in spring slots, slow key return, jack height (capstans), capstan friction, wippen or hammer butt friction, hammers deeply grooved (hugging the strings a little), bad hammer travel, bent center pins, warped action rail or frame, spring rail out of position (loose screw, missing shims), strawberry jam, poltergeists.

Alan Barnard
Salem, MO
Joshua 24:15






Original message
From: "Michelle Smith" 
To: "Pianotech List" 
Received: 01/23/2007 10:09:49 PM
Subject: jack not returning on high treble


Hi everyone.  I briefly worked on a drop action piano today (the type with capstans and inverted stickers instead of lifter wires and grommets) that the jacks would not return after the initial strike.  We see it every day, right?  Well, I did a multitude of tests to see if it was a friction issue.  It wasn’t.  I didn’t have a lot of time to make adjustments (I was there to work on a different piano) but here are two facts to ponder.  First, it was ONLY the notes that do not have dampers (the extreme treble).  Second, the dip on these notes was slightly less than the rest of the piano, otherwise, all measurements were the same.
 
Thanks for helping the eternal newbie.  =)
 
Michelle Smith
Bastrop, Texas
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