A buddy of mine, Pete Cardone, recently purchased a Lauter Humana on
which I did some minor repairs.  I was very impressed with the player
action.  This thing has separate valves for each note that are held to
the stacks with two screws, permitting anything to be repaired without
taking the whole thing apart!  The valve blocks are wood and can be
easily taken apart for repairs or plastic replacements are available.
Generally, Pete's piano only suffered from loose screws in everything.
As all the valves are simply screwed together with gaskets, simply
tightening the valve screws and the screws covering all the parts of
the pump tightened the piano up substantially.  I hope yours can be
helped with such simple work.  The Lauter is nice; the spool box even
folds out to permit access for tuning.

- Ed Gloeggler