Although the grounding braid is fun to install, if you are into doing it over kill where it doesn't matter at all (and you are), it will serve very little to any point except maybe, and I mean maybe when you power on and off the sucker with your hand on something that is grounded and there is a short in the switch. Thus, not likely. I have powered on and off 100s of games, literally hundreds of times and never received a shock. Old games, occasionally, but games like King Pin, never. BTW, the best part of your restoration is the time it took, the photos and growth you have made, along with you side stepping and restoring/building a compressor along with finally getting 240 installed for your new blue baby. Now, trick question, if the meter reads 6.3 volts AC or DC, what is the actual voltage likely to be? Think RMS.