It's amazing to me that rare items seem to come in packs.  Quite a
while back I had three Apollophones come in for rebuilding over the
course of a year and a half.  I've never seen any before or since.
I have to concur with Jere DeBacker -- I have never seen two Melville
Clark pianos that were alike either.  In fact, the last Apollophone
I restored had the same spring wound roll drive and pump, but had an
Amphion player stack, which was probably a good move for them.

In answer to Diane DeTar's question, they pump very well since there
is no air motor taxing the system, but -- and I say BUT! -- there are
two important things which I learned the hard way:

(1) You have to be sure that the little block that goes through the
valve into the pouch goes back into the pouch it came out of.

(2) Also, the valve must be air tight on the screw stem but free to
pivot a little.  Make sure when you turn the screw in that it is
matching up with the old threading and not binding or being forced out
of position, otherwise you will have seating issues that will be very
hard to detect and a player that won't pump very well.

Brian Thornton - Short Mountain Music Works
Woodbury, Tennessee