In MMD 140213 Joseph Osborne wrote, "How does one take out lost motion
between the Duo-Art stack and the piano action?  If there is a way to
adjust this without removing the stack over and over again, I cannot
see it."

I've just recently done this; the best method is to remove the head
of the action (spoolbox, roll-motor and roll-corrector) from the stack
(including the tubing).  This gives you access to the top of the stack.
Sliding it in and out can't be avoided, I think, but at least you can
see what you're doing and the stack is way easier to slide back and
forth.

I noticed a serious increase in power and playability after the
regulation.  Putting the head back on and re-connecting the tubing was
easier than I expected.  It's certainly worth the job when there's a
lot of play.  I always leave a gap of about 0.1 mm between the player
action and the piano action.  It's barely noticeable  but this ensures
the pianola action doesn't interfere with the piano action on hand
playing.

Regards from the wet Netherlands,

Niels Berkers