It's hard to see but, I'm guessing there is a groove in the tips of the electrodes and when you push the ring in it keeps pressure on the joint and then welds. Is it always live or does the pressure of pushing the ring in activate the welder? Nice device!
You're definitely underselling yourself with your labor costs but, that's often the way it works out I suppose. I've done a lot of metal, wood, mechanical stuff for people over the years and always short myself.
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