I am in the process of rebuilding my steel plate swing keel. I am thinking of welding in stainless threaded tabs and inserting Stainless studs to mount zincs. The boat will be trailer launched in salt water. Also My boat has a heavey gauge copper wire attache to the mast tabernacle and runs down the compression post to the keel pivot bolt. What is the best way to make contact with the bolt or should run a copper rod through the keel trunk?