I am happy to report that the 250 watt ZW is back together and functioning well! Whistles like a champ! The only thing I am not happy with is the 15 amp resettable circuit protection. It does not trip and reset as quickly as I hoped. In fact, it is very difficult to trip period! I am thinking of using a 5 amp resettable circuit breaker similar to the ones we use between the exterior of the transformer and the track.
It has been a journey that I look forward to repeating again. Our club has twelve ZW's that need cleaning, refurbishing, etc.
Joe, I am sorry I did not see your post. I did not put any conductive grease on the contacts. I just scrub them with vinegar and salt and polished them with some ultra fine sandpaper.