Stainless Screws in Aluminum

[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?

[Jon W]

Did you try PB Blaster?

[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.