Join Date: Feb 2010
Location: Narragansett Bay
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Re: Zinc and Outboard
Sounds like the anode is working and that's a long time for one anode. Personally, I would just try to replace as designed. Drilling holes into the lower gear unit sounds ominous. I suppose you could be sure you don't penetrate the internals, but one never knows if there is an odd passage cast into the leg somewhere. You'd also need to know you were not inadvertently choosing a location that was insulated from other underwater parts, or the anode wouldn't work. I'm sure you'd figure these out, but I'd just do it right.
If you can't figure out how to get the stub out, post a pic and someone will have a good idea.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.