by jalmeida51 » Sat Jun 26, 2021 11:40 pm
I don't think corrosion is causing your problem, you do have some corrosion at the base of your mast. It appears that your tabernacle hinge is distorted. I have a 1981 Daysailer1 built by Rebel and after a sail in some strong winds I noticed my stays were rather loose. Then I had 3/32 shrouds and forestay. Next day I noticed the bottom hinge that bolts through the cuddy roof had a gap just like the gap on your mast. Two of the four 1/4 inch bolts were loose and pulling through the cuddy cabin roof. Also there was a smaller gap at the hinge at the mast base. I had a local machine shop make up a stainless steel plate to beef up my roof so the bolts can't pull through it. Upgraded the the shrouds and forestay to 1/8 inch with turnbuckles. Replaced the spreaders with heavy duty type. Replaced the tabernacle hinge. After all of that I haven't had any more problems.
You could remove the tabernacle hinge and lay it on a flat piece of metal and see if the hinge lays flat. If it is not flat you could try to pound it back into shape. Check the 4 bolts attaching the hinge to the cuddy and make sure your shrouds and forestay are tensioned properly. If you have 3/32 shrouds you should consider to replace them with 1/8 with turnbuckles.
Best of luck, John