I've rebuilt a few Lauters, and was shown a way to easily rebuild the
wind motors by a seasoned (sadly now deceased) player tech
(Teddy Spangenberg of Boonton Player).

The Lauter wind motor has six pockets/pouches and a crank shaft.
Two pouches are used (in opposition) instead of one pneumatic, so
over all there are three drive points for the crank shaft.

After you have cleaned off the old pneumatic cloth, you glue down calf
skin over the pouch hole as a replacement.  After it has dried, you
stretch the calf skin by pressing/working it into the opening.  You
then glue the attaching disc to the center of the calf skin.  After
the unit is rebuilt, you need to coat the calf skin with diluted rubber
cement, then treat the cement with Talc to keep it from sticking.

This is a simple way to rebuild the motor, and it holds up very well
over time.

I agree with earlier posters, The Lauter-Humana is a phenomenal piano.
I rebuilt one action that didn't even need the striker pneumatics
recovered, and it was original cloth!  The only weak point on them
seems to be the lead tubing from the tracker bar.

Scott