Pianotech

  • 1.  '57 Baldwin M Sostenuto

    Registered Piano Technician
    Posted 09-22-2021 22:50
      |   view attached
    I'd like to regulate this sostenuto, but it shows no sign of being adjustable. The sost blade need to go another 2mm under the tabs (and they themselves need to be leveled). My best idea is loosening the mount onto the belly rail on sticking a paper clip on the locator nail on top, hoping to lean the blade below, inwards. I have no idea where the trapwork gets limited/adjusted.

    I hope I'm not looking at a "set'n'forget" installation.

    TIA

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    William Ballard RPT
    WBPS
    Saxtons River VT
    802-869-9107

    "Our lives contain a thousand springs
    and dies if one be gone
    Strange that a harp of a thousand strings
    should keep in tune so long."
    ...........Dr. Watts, "The Continental Harmony,1774
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  • 2.  RE: '57 Baldwin M Sostenuto

    Registered Piano Technician
    Posted 09-23-2021 15:28
    I believe you can bend those brackets a few millimeters. I happen to have a 50s Baldwin M on its side in my shop and I can see that the sos lever is limited by a block of felt. Adjust it by adding or subtracting from that block.

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    John Pope
    University of Kentucky School of Music
    Lexington, KY
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