[CAUT] M & H model 50

[Don Mannino]

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Aaron
=20
I agree with others regarding the jack clearance causing the hammer
bobbling.  Very likely the hammer butts have become worn, which causes a
harder letoff resistance, plus there is perhaps not enough aftertouch
(i.e., jack clearance).  Firmer flange pinning can reduce the hammer
bobbling, but it might just be hiding the real problem.
=20
As for the stickers, I only repaired this on one piano, and it was a
long time ago, by the key / capstan / flange center line was way off.  I
have observed the problem on 2 other M&H 50s from that era, so I suspect
it is in all of them.
=20
The problem is that the sticker cloth is sliding forward very badly on
the capstan during play.  On the one I repaired it was observable by
eye, and the wear on the sticker cloth was a long mark instead of a
round dimple.
=20
The repair is to move the tongue flange rail up.  The corrects the
sticker movement to match the capstan, and the friction level goes way
down.
=20
I did not make any notes to myself as to how much I moved the rail,
though.  I think it was about 8mm up, but it was a long time ago.  I'm
afraid you will have to experiment a bit and observe carefully, both to
be sure this piano has the same problem, and to be sure you raise the
rail the correct amount.
=20
Good luck!
=20
Don Mannino
=20

-----Original Message-----
From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org] On Behalf Of
Aaron Bousel
Sent: Sunday, January 15, 2006 8:34 AM
To: College and University Technicians
Subject: RE: [CAUT] M & H model 50


It has stickers. I don't have it in front of me, but my memory is that
they are different looking from the typical old upright stickers. I'd
guess that they are maybe around 4" high. Please tell me more about this
fix.=20

Thanks,
Aaron




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