I also had a problem with a PPCo rewind not shifting into rewind on a
tight action.  As I remember I felt the valves seemed to float into
reroll rather than snap into reroll.  I built a primary valve and put
it on the wind chest on the lower unit.  The tubing goes from the
tracker bar to this primary then to the reroll valves on the reroll
pneumatic.  This solved the problem quite well.

John Dewey