Can someone explain how the Wurlitzer duplex roll mechanism works?
I was tuning a Wurlitzer 146B and have found that a couple of things
work on one roll frame but not on the other.  Also, many notes seem
to come on late or not at all.  I thought this might be because of
a plugged bleed hole, but the bleed seems fine.

All I can think of is something in the duplex roll mechanism.  Is it
possible for dirt to get in there?  I tried the tracker bar pump but
that didn't help.  This band organ was restored just a few years ago.

Dave Clark