I'm checking with the brain trust to make sure I've got this right.
With the head removed from the wind chest, I've taped off the note
hole channels and the vacuum supply channels.  When applying vacuum
to the supply nipple underneath, no pneumatics should close, correct?
Then when I remove the tape on the note holes, the pneumatics should
snap closed, correct?

On the most recent test, when I did this, the pneumatics came up very
leisurely.  However, the unit is airtight enough to hold all 88 of them
shut.  That's something, I suppose.

Is this an accurate test for the operation of the secondary valves,
or do I have to test it with the head and primaries in place?  I'm about
to set fire to the whole lot and move on.  It feels as if I've forgotten
everything I've ever known (although I think I haven't restored a
double valve unit before).  Many thanks for all assistance!

Skip Downing