Richard, I have two ZWC transformers and the pot mounting brackets inside one did break. It was on the first issued model and aluminum brackets were available to correct this. I changed them out and after recalibration have had no issues. Either way, to pull the top off and check/reset the gear alignment, as Richard stated, is a good thing to do. And it is not difficult to perform. Have you tried a recalibration as outlined in the manual it came with? I have done this more than once with the second model of the ZWC. Well worth doing, and with the use of all 180 bricks, great power for my layout.
Jesse TCA
