This may be a long shot, but here goes...
I removed the teak handrails on my 35' O'day. The handrails looked like crap, and would give you splinters if you tried to hold on to them.
Here is a pic that does not quite convey how bad these were, but it will give you an idea;
Those sorry looking things under the spacers are rubber gaskets, which I plan to replace with butyl tape.
The hand rails were attached using a #10-24 stainless steel screw that was cut down to 4Ľ". The screws were set into 7/16" recesses, and were run through the inner handrail, a spacer, the headliner, the deck, a rubber gasket, another spacer, and the outer handrail. There is also a washer under the head of the screw, and a nut set into the outer grab rail. The recesses were capped with teak bungs, which were epoxied
into the recess. Here is a diagram of the attachment method;
And here is a picture of one of the screws;
Unfortunately, I buggered a couple of the screws during the removal process, and now I need some new ones. The only problem is, I can't find a source
! The closest that I can find is a 4" screw. I've tried McMaster-Carr, D&R, and googled for hours... still no luck.
Suggestions? Sources?? HELP?!?