In my query published in MMD 000126, I mis-identified the location of
the celluloid strip as being a guide for the "primary" valve stem.
I meant to say the celluloid strip was on the "secondary" actuator
stem.

I am sorry if those familiar with the mechanism have been wondering
about a "new" design.   The secondary actuator stem is visible under
the glass cover housing the electrical contacts.  That stem moves the
contacts and the guide is also visible through the glass.

Bob Taylor