Hello all,  It has been a few years and I seem to have gone a bit rusty
with some details.

What is the correct opening dimension for the Duo Art expression
regulators?  The box I am dealing with has been rebuilt with some vinyl
upholstery material so I can't be sure.  Currently, the Accompaniment
pneumatic opens 1/2" more (at rest) than the Theme pneumatic opens.

I am reasonably sure that they should be the same size, right?  This is
a 1923 action.

Kind regards,
Bernt Damm
Sydney