Hello.

I just want to thank everybody for helping me out with the roll scale
and tubing dilemma: "Seek 20-Note Organ Scale & Tubing Dimensions", MMD
99.10.12:  http://mmd.foxtail.com/Archives/Digests/199910/1999.10.12.08.html

I'm sorry I neglected to ask about the hole spacing and diameter too,
since I'm making my own tracker bar.(silly me!) I also forgot to brief
you on the organ itself. The pipes are made out of a surprise material
that I'll talk about when they're finished. The organ uses the
valveless action (pressure in roll compartment) to operate. I don't use
bellows in the organ because it's a well known fact that in organs with
a one or two crank crankshaft, the weight of the bellow brings the crank
down when you stop grinding. I'm not against bellows in any way, and
it's true that a rotary coin piano pump can run very smoothly. The pump
is made out of PVC plastic(don't laugh) or wood and consists of two
coach's whistle shaped pieces of PVC plastic or a wooden box with a 1"
or 3/4" brass nipple at one end for attaching the hose carrying pressure
or vacuum.

One side of it is pierced with oval holes for intake or exhaust and the
two sides have ball bearings set in them. What makes this pump work is
a 3/4" steel cylinder mounted on the 3/8" axle, and a pulley mounted on
the shaft where it protrudes outside the housing. There are notches in
the cylinder, and blades made of metal or plastic are inserted, then
glued in. I hope this lengthy description doesn't make it sound
complicated, for if you look at the somewhat messy(but discernible)
sketches of the organ (which I will be E- mailing shortly) you will
find it quite simple.

sincerely,
Andrew Barrett