Have to make a no-longer-supplied shaft for the tilt bracket on my 1967 Evinrude 60 HP V4, plus a foot long bolt for the bracket because I can make it in mild steel for about $4 instead of $80 for a new part.<br /><br />I know stainless is best in theory, but looking at the table of active/inactive metals http://corrosion.ksc.nasa.gov/html/galcorr.htm <br />stainless is way up the other end from aluminium while mild steel is pretty close to it. This means that galvanic corrosion is going to be a lot worse with stainless and attack the alloy, while straight salt water corrosion is going to be a lot worse with mild steel and attack the steel.<br /><br />I'm thinking I'll do it in mild steel (not least because I don't have tools to cut threads on stainless) and give it a good coat of fish oil or some other corrosion fighter and grease it up, then pull it apart every year as part of the layup process and clean out any corrosion that's appeared. <br /><br />Any thoughts?
