I am in the process of rebuilding a vacuum pump from a Hammond player
organ, model BA.  After completion, I find that I have only 10" water
vacuum at the output port.  The information I have is that there should
be 30" water vacuum.

I have looked at all connections and found none to be leaking.  The
only modification I made was at the "V" end, where the stationary
boards of the pump come together and the channeling is that allows
passage of vacuum from the pump sections.  Two medal rods pass through
this section to clamp the pump boards together, with nuts on each side.
The modification that I made was to replace the original leather
gasketing with cork.  Could this be the source of the leakage?

Eugene Rogers
Miami, FL

  [ For more information about the rather rare Aeolian Hammond player
  [ organ, see http://www.jrjunction.com/aeolian%20hammond.htm 
  [ --Relief Editor.