Just throwing it out there that it doesn't seem like you should have to remove the handles for this fix. It sounds like the gears skipped some teeth, so the fix may be to loosen the pot's mounting to separate the gears, then turn the handle to it's proper position, before re-securing the pot. I'm unsure of the exact details, but I believe there is a know issue with a plastic mount on these transformers and the gear slipping issue can be solved by using a metal replacement bracket.
JGL
