Originally Posted by
Hatsuwr
Well... That was fun. Probably going to drill out the holes a little and replace with M6 aluminum rivet nuts. Pairing that with 12mm long zinc-plated steel hex screws, hot dipped steel/neoprene sealing washer, and aluminum based antiseize - should prevent any future corrosion issues!
Try Tef-Gel, I use it on all dissimilar metal joints. I would also suggest stainless fasteners over zinc-plated.
https://www.tefgel.com/contain.php?param=tefgel_infor