and have them symetrically trimmed on a lathe. The machanist will tighten the bolts chuck the zinc in the lathe and make a cut across the face and chamfer the corners. Then turn it around and do the other side.
Your looking at the full size zincs..West Marine,Defenders,Boaters World,Blue water all have a smaller type that is rounded like a donut rather than the cylinder type. Good Luck>>> David
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