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You can isolate the AL from the steel using small pieces of 1/8” nylon sheet between the pad on the step and the mast. (source: McMaster-Carr
). Then use SS screws with threads and heads coated with Tuff-gel or similar thread protector. It’s the same technique I use in mounting winches on an AL mast.
(Edit: Just realized this is an old post....but I’ll leave the comment up anyway.)
Last edited by billyruffn; 01-29-2012 at 11:08 AM.