Looks like a stress crack with some fairly decent corrosion?
Which part is this, exactly? Can you show me on the gimbal ring?
Salt water? Moored? I've removed my gimbal a few times, my bolts look brand new? My guess is improperly installed?
Alpha one gen II torqued to 50 ft/lbs last march. It's in salt water but I flush and rinse with salt away after every ride. It came right out of a brand new sierra bag but obviously it's not the right nut as it's cheap **** chinese steal. Couldn't tell when it was new because it looked like it has a nice zinc on it. I put a 3/8 fine thread SS lock nut on just now like what should have been in the bag in the first place.
Has nothing to do with improper install. Cheap **** metal plain and simple and my stupidity for not using the plethora of stainless I've accumulated over the years.