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The reason for welding the annodes on is to assure that the electrical connection remains good for the whole life of it. As the zinc diasapears it may become loose on a stud or bolt and the connection suffer. No continuity no protection.......no ..... The prop should be protected with the right size shaft annode bolted on. A recent method done and proven (three Years) by one of our members (metal boat society) was to weld stainless steel blocks onto the hull, and then weld stainless studs to that. This allowed the annode to stay in touch with the hull, because the stainless bits dont need to be painted. The annodes should also stand off from the hull. The direct contact with anti foul can cause problems.
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