I am working on two Ampico B drawers and have a problem on both of
them that has me befuddled.

When the transmission goes into rewind, it begins winding and the
shifter then slips a tiny amount out of rewind.  This stops the roll
action and begins a tick, tick, tick as the tips of the pins hit
without locking in enough to pull the roll.  I have strengthened the
compass spring but to no avail.

I also have a problem playing A rolls because of the #5 Bass hole that
was crescendo for A rolls is the Replay pneumatic for B rolls and the
drawer.  This is especially bad if the transmission had trouble staying
in rewind anyway as the fast opening of that hole gives the system a
quick kick out of gear.  Is there a better place to put this tube?
Perhaps to the unused sub-intensity as these are both A expression
pianos?

One other question to those of you who have done numerous B drawers: On
the four-valve block "rewind/replay/brakes/shutoff" box, one piano had
the following and one did not.  Which works better?

On the lower right valve block there is a cardboard insert into the top
metal valve seat that has a small hole drilled into it.  Obviously it
is to slow down the off portion of its activity.  Since both of these
drawers worked before the restoration, should this cardboard disk be
replaced or not?  Was it factory or previous rebuilders that put it in?

DL Bullock - St. Louis
http://www.thePianoWorld.com/