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Old 10-31-2019, 11:30 PM
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Al Schober Al Schober is offline
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Go to McMaster.Com and shop for cobalt drill bits. You know what sizes you need - might even find some left hand bits, also cobalt (great things).
Stainless tapped into aluminum is trouble down the road - not that I haven't done it myself! Blocks into a boom (#8 fasteners) are one thing, bow straps into a stem fitting (1/4" fasteners) are another.
I had a SS spinnaker track attached to an Al mast with SS fasteners. Corrosion bent the track to the point that the car would no longer go up/down. Managed to remove and straighten the track. Reinstalled using new SS fasteners, but with a strip of electrical tape between the track and the mast. Problem solved.
Case #2 - jib halyard winch working hard. Standard bronze winch, aluminum mast, cast aluminum spacer (flat to curved mast). Remove screws and the winch base comes off in FIVE pieces. Corrosion between the bronze and aluminum. New winch installed with electrical tape between the bronze and aluminum. Problem gone.
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