Stainless Screws in Aluminum

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crieders

need to replace cables. Figured out length and obtained Edson's print out of the way to do it. but of the 4 screws down thru the binnacle only 1 came out. the others are fast tight in spite of tons of lubricant and a 3 foot long screw driver as well as impact driver. no budge. Whats the next safe step?
Cliff Rieders, c34 tall rig, 1990, hull #1022

Jon W

Jon W.
s/v Della Jean
Hull #493, 1987 MK 1, M25XP, 35# Mantus, Std Rig
San Diego, Ca

KWKloeber

cliff

Welcome to the whacky world of galvanic corrosion and salt air/water.  You may need to drill pathways to get PB down into the threads (and repaint), or drill out the heads to remove the bolts.

I previously posted a few (YouTube) test results of different corrosion busters that you might look at.  Searh for that or search YT for "Project Farm" channel and his tests.
Twenty years from now you'll be more disappointed by the things you didn't do, than by the ones you did.
So throw off the bowlines.  Sail away from the safe harbor.  Catch the tradewinds in your sails.
Explore.  Dream.  Discover.   -Mark Twain