Do I need to manufacture my own loopback plug, or is
that not required
for the 745?
Some have a jumper (inside) that does the same as the loopback plug.
Also, what's the concencus for preserving the
rubber cups. Mine are
neither brittle nor have they turned to goo. How can I keep them
that way?
Ubik?
Avoiding UV, ozone, and extremes of temperature and humidity will help
slow down entropy.