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Marc-
You can't really use a zinc in the case of something like this. You're much better off using a galvanic isolation washer made of thin plastic or galvanic isolation compound, like Lanocote or TefGel. I wouldn't go cutting grooves in the stainless part, as it might be used as a bearing surface to some degree. Cutting a gutter in it would drastically increase the wear on whatever part rotates on it.
If you are really having a problem with it... why not get the part made up by a machine shop in all stainless or all marine bronze (which is considerably easier to machine IMHO).
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Sailingdog
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Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.
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