I am rebuilding the legendary Duo-Art electric long-play top action to
put into my Steinway "D".  This is the gear exchange with the cones to
govern speed.  I have two of the only 20 total that some guess were
made.  In conjunction with the vacuum play break, they make the Model
"B" drawer positively stone-age.

At the present stage of my work, I could loan it to my machinist (he's
good) to make copies.  Price would be time & materials -- not cheap.
If you've had fantasies about coming across one of these, now could be
your chance...

Bruce Grimes