Upright Hammer Shank Length

[TOM DRISCOLL]

  Subject: Upright Hammer Shank Length


  I'm installing a new action in an upright. I need to find the "sweet" spot up at C88 to determine how long to cut the shanks (determine strike point). Doing this on a grand piano is so easy by sliding the action in and out a bit and the hammer assembly can be glued nice and firm for good sound production. 

  Does anyone have any suggestions on how to do this on an upright? If you move the action, the regulation changes, and if you have the hammer mobile, I fear it is too loose to really get a good sound. How do you folks do make this determination?

  Terry Farrell
      
  Terry,
      Thinking out loud here---How about a scrap butt @88 with a set screw on the side.Preglue the hammer on the shank,adjust for that "sweet spot " tighten and measure from the bottom of the hammer moulding to the top of the butt. 
      Add the depth of the hole(s) and there is your length.
      Might work.
      Tom Driscoll
    
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