Hello, MMD.  I'm aware that I may be trying the patience of some
readers, but Tasmania is not a hub of player restoring activity,
and I suspect that no-one else here could answer this question.

I have begun to investigate the valve chest whose contents control
the movement of the accordion pneumatics.  I numbered the valves
1 to 8; not very enterprising but I can find many other opportunities
to confuse myself.

First I measured the valve travel as it presently is: here are the
results:

Valve  Valve   Accordion
 Nr.   Travel  Travel
      (inches)(inches)

  1    0.044   0.0625
  2    0.044   0.125
  3    0.044   0.250
  4    0.046   0.500
  5    0.044   0.500
  6    0.041   0.250
  7    0.040   0.125
  8    0.042   0.0625

Valves 4 and 5 have inlet brass nipples that are 0.315" O.D.; these two
valves control the two half-inch accordions.  All the other valves have
inlet tubes of 0.225" O.D.  When I got to valve 4 I assumed that the
extra valve travel and nipple diameter was to accommodate the extra air
flow from the larger accordion.  But the results from valves 5 to 8
don't really support that idea.

Does this matter, or am I worrying about nothing?

John Phillips in Hobart, Tasmania