|Thanks for the info Damien. |
I recently capsized 'Good Feelings' in a fierce electrical hail storm of around 50 - 60 knots on Lake Wivenhoe Qld. Later I discovered the cracked tabernacle as well as fractures to both chain plates. I don't know how I was'nt dismasted.
Consequently I'm acutely aware of the mast's well-being and am hesitant about drilling more holes in the mast. Like me the mast is not getting any younger.
I'll keep my eyes open for some alternative to a bolt-through-mast device for rotation control. I'm thinking along the lines of a pear shaped clamp and tube extension, the clamp to match the pear shaped mast.
I've learned from a couple of sources that the SS U bolt chain plates can suffer 'crevice corrosion' if they are sealed with a non-neutral sealant. I've been told to inspect them every few years. In my case the leading portions of both U bolts snapped inside the under deck hardwood supports. They would not have been detected had a sharp eyed friend not noticed that the chain plates had a slight tilt of a few mm.