I remember seeing one where they had grounded the light to the deck... but that's the only reference I can remember. I think it was all because of rewiring using a polarized cord.
Sounds like we had similar evenings! I researched if an electronic pedal powering a 110-120volt 0.7amp motor will be within limits to use on a 100-110volt 0.6amp. I'm 'fairly' certain it's well within in range. (read: 2014 Singer Simple wiring adapted to 1928 Singer 101 potted motor).
This is going to be fun...