Jeff Davis is correct that most Universal Players used Perflex pouches.
At the time these were touted as "forever" pouches, not subject to the
ills of leather pouches.  Well, the company supplying the Perflex
changed the formula from what was tested as the "prototype" and the
results were disastrous.  Perflex dries up and cracks, or turns to
powder, making the player unplayable.

What makes this difficult for us today is the Universal Player action
stack is made of aluminum.  Now, while air-tight (no wood grain to
leak), it's not what we are used to.  The pouches are held in by
plastic rings, which have to be carefully withdrawn (read: pried out
without destroying them) and new leather pouches (Columbia Leathers
"sealed" pouch leather works well) glued on them, then replaced in
the stack.  This can be done without taking the pneumatics off.

There is also the issue of the valves, which are plastic; are they in
good shape?  Will they last another 25 years?  If you question them,
I'm not certain where the replacements are (see further comment after
the next two sentences).

Also, what about the pneumatics, will they last?  They are traditional
wood pneumatics, glued on with "space age" stuff; I'm told that PVC-E
works well.  I will admit, although I know how the process is done,
living here on the West Coast, there is a rebuilder in Southern
California who can do the work in a short time and at a cost I cannot
compete with in my shop, so I send them to him.  The shop is Gold
Coast Pianos [San Jacinto, Calif.].  I've been very satisfied with his
work and my customers (the few who are willing to spend the $$) are
happy with their pianos.  I've made a wooden box that holds the stack
for shipping using the stack mounting flanges.  It seems to work pretty
well.

The biggest pain for me on the rebuilding is labeling all the note
hoses, disconnecting them, and keeping them out of the way while I drop
the stack, which is held in place by two screws on each end.  All that
while lying on my back on the floor under the keybed.  I've not tried
using a piano tilter for this process, maybe that would be more
comfortable.

As for the roll motor, besides the gears, there are the electronics.
Some parts are available from specialists -- here is when Google is
your friend (even on dial-up!).  These Universal pianos are usually in
nice, detailed cases containing a mid-level spinet piano, usually with
compressed action, not drop action.

David Dewey
Oroville, California