[CAUT] M & H model 50

[Jon Page]

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>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.

This effect dawned on this morning. As the sticker is lifted, the arc 
of the support arm
pushes the cushion towards the front.  A bolstered cushion would 
minimize the sliding
friction but the felt is too short.

Not having a sample in the shop I can only speculate.
What is the optimum travel of the support arm?

Is it lifting to (slide forward) or from (slide back) a horizontal position?

Or lifted crossing the horizontal position through the key stroke, 
this would cause the
sticker to change direction by being pushed forwards at the beginning 
and pulled
backwards at the end of the travel.

We need someone to test these different executions for friction.

As far as bobbling hammers go, I'd check the hammer blow and key dip to insure
jack clearance.  Decreasing the blow and taking up the lost motion might may be
the cheapest fix.
-- 

Regards,

Jon Page
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