Kram
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The problem with electrolysis, its not a sealed container and you cant easily seal it up while allowing the part to be eaten.
Wrong way around, the anode/positive is eaten, cathode/negative grows with whatever metal is in solution. If the part to be eaten is stuck in the head that will be the anode and the cathode is the submerged wire. Use 12-20v, the steel should be eaten first. Using a bulb in series will make it very slow, a cheap buck/boost converter will give lots of control over itHead is cathode.
Bit of ali welding rod as anode.