request advice on sostenuto trapwork design

[robert goodale]

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We install tons of PianoDisc systems which require major overhaul
of the original trapwork for installation.  Everything except the
shift lever is removed and replaced with retrofit parts.  Over
the years for whatever reason we have been saving most of the
parts we remove.  The end result is that we have a couple of huge
boxes overflowing with trapwork levers.  Not long ago we
disgarded several additional boxes due to space.  We have all
kinds of trapwork levers from a variety of different pianos.
Levers, pitmans, pull thingys, push thingys, up thingys, down
thingys, and hundreds of springs.  I may be able to provide you
with something that will fit.

Rob Goodale, RPT
Las Vegas, NV


Mark Ultsch wrote:

> List, I am attempting to rebuild a 1920's 5' George Steck that
> is missing all sostenuto linkage between the pedal rod and
> pitman.  I'm unable to find replacement parts or pictures of
> the original replacement.  (Thanks to you all who looked for me
> a while back.)  So. . . it appears that I need to design some
> parts.  Being a novice yet, I have a few questions: 1.  What
> kind of pin should be used?  what diameter?  should it be
> plated?  (I can't find anything in parts catalogs.) 2.  What
> kind and size of felt is generally used in the bushings and
> what is the relationship of hole diameter in the block versus
> the pin diameter and felt thickness? 3:  Any thoughts on the
> spring rate of compression spring to be used?  Any good sources
> to purchase these? Sorry if these questions are too basic.  If
> you have other thoughts or concerns I'll be happy to get them.
> Thanks all. Mark UltschMadison  WI

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