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anode placement - outboard shaft
A friend of mine who is a diver is going to replace the zinc anode on the shaft of my Catalina 27.
He is not familiar with boats, and the last time it was the "yard" that did the replacement in a lift (and regretably I didn't get a picture to use as a reference).
Where should I tell him to place the anode; middle of the shaft? closer to the strut?
Also, does anyone happen to know what the shaft diameter might be? (Farymann 12 hp diesel)