Well that's a pain!
I think I'll overhaul my 1950's ZW as a backup. The only thing I really like about the new one I have is the circuit breaker is really fast-acting when a car derails. With my old ZW, I ended up with burnt rivet connections on my 1122 027 switches when my son (then a 5 year old) didn't know to throttle OFF when a derailment and short occurred. That was 30 years ago.