Indiana?  Never heard of anybody there.  There is or was a person
in Missouri who rebuilds Gulbransen stacks.  He sends you a special
"coffin" that you use to ship him the stack.  After you get the rebuilt
stack back from him you ship back the coffin again.  All this sounds
good so far.  Unfortunately, my term "coffin" is too appropriate,
because his rebuilding is of generally poor quality.

For example, each pneumatic has a tab that must match exactly the
position of the corresponding part of the piano action.  A careful
rebuilder who didn't have the piano available for reference would note
the exact horizontal placement of these tabs before disassembling
anything.  He didn't.  When I got the stack back, I had to heat each
tab's glue, and move the tab about until it activated only one note
instead of two.  I became very good at getting the stack in and out
of the piano.

The pedals of the Gulbransen have the image (also seen in the company's
ads) of a baby easily pushing the pedals.  For my piano, that baby had
better have grown to be a teenager with plenty of athletic experience,
because he is going to have to move a lot of air just to satisfy the
leaks in the reassembled stack.

The rebuilder was remarkably secretive to me over the phone on what he
uses for an "opening" technique on the Gully stack.  He apparently uses
a saw and a gasket. I trusted him to do a good job.  I guess he trusted
me to keep quiet about his poor workmanship.  He didn't, so I haven't.

If one plans to rebuild a Gulbransen stack, there are several techniques
I have heard.  Here are some I remember:

1) Hammer on it gently until the glue joints break apart.

2) Put in a grocer's freezer for a couple of days, then set it on an
area on the floor where there is a slight depression.  Jump on it.

3) Build a huge extension cavity for your microwave oven, and heat it
until the glue melts.

My overall advice?  Get hold of a piano with a Standard or Autopiano
player action, and rebuild that instead.  Worked for me.

Peter Neilson
Sanford NC