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Design Flaw - A BAD Idea

  • 1.  Design Flaw - A BAD Idea

    Posted 12-04-2017 19:32
    Edited by Jon Page 12-05-2017 07:19
    While burnishing the rep levers on Renner wippens, I realized that the index cut in the lever causes friction!  As the key is played, that cut/groove/gouge travels forwards along the knuckle (while the knuckle rotates on the lever). The mark, if it needs to be there, belongs on the side and not the top. I looked at my Kawai action model and the mark is on the side of the ABS rep lever and NOT on the top. Good for Kawai.

    Really, what a bad idea it was in the first place. I hope it gets corrected industry-wide.

    While they're at it:
    Taper the top portion of the dowel Let Off buttons on grands. It would be so much easier to get a tool in to adjust the jack rest screw.

    Also, use square drive screws. How much easier it would be to work on vertical hammers without the flair of a slot bit screw driver. A ball-end square-drive driver operates at an angle. Plus, a screw stays on the driver as thought's locked on for installation.


    Jon Page

  • 2.  RE: Design Flaw - A BAD Idea

    Posted 12-04-2017 23:07
    Hello Jon,

    One advantage to having slotted hammer butt flange screw heads is that the flange screwdriver can easily push the jack aside to access the screw. In Canadian pianos that use Robertson head screws, generally the wippen flange screws and the damper flange screws are Robertson, but the hammer butt flange screws are slotted (presumably for that reason).

    Peter Stevenson RPT
    P.S. Piano Service
    Prince George BC

  • 3.  RE: Design Flaw - A BAD Idea

    Posted 12-05-2017 05:41
    But a ball-end driver would be better:



    Jon Page

  • 4.  RE: Design Flaw - A BAD Idea

    Posted 12-05-2017 06:55
    Steinway removed the indexing mark on the repetitions a few years ago for this very reason. It makes a small but noticeable difference. 


  • 5.  RE: Design Flaw - A BAD Idea

    Posted 12-05-2017 09:20
    I believe it is on the underside now...and pretty accurate as I recall the last set I did...I think...


    Peter Grey
    Stratham NH