Here is a tip on servicing A.F. transformers with meters.
When removing the nut that secures the wire terminals to the meter use a second tool to hold the nut below the terminal (solder) lug. In my experience this keeps the terminal post from turning.
I use a pair of ignition pliers that had the width of the head ground down for another project.
I will be looking for something better.
Here is the issue:
On every commercial panel meter I've handled, the terminal posts on the back of the meter are keyed to the meter so they cannot turn when you tighten the nuts to hold the terminal (solder) lug. Whomever made the meters on Flyer transformers used plain screws. On the last four meters in transformers I went to service the screw started to turn with the nut instead of the nut loosening. On 3 out of the 4 I knew enough to stop and secure the lower nut. The first time I did not expect the problem, and didn't realize the screw was turning with the nut. It happened to be the screw with the fine wire running to the electromagnetic part of the meter. The wire broke in such a way that there wasn't enough left to reattach it to the screw or splice in a new section of wire. The net result was a dead meter.
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