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Isn't there a spring to counterbalance the arm?
One solution to the safety problem is to disconnect the ground from the arm so it floats and then add a high value resistor and perhaps a capacitor between it and the chassis (or tonearm ground). Thus you would have to touch the cartridge body to access the power line.
I agree that there is no reason to keep this original if it's dangerous. On the other hand, do you really intend to use it once the job is done? I wouldn't subject my 78s to such a beast.
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