FWIW,

I went with a Windline URM-3;



It is probably overkill, as it is their largest roller, with over 18" of channel. I wanted to have a lot of metal in contact with the deck to distribute the stress. I have made an oak mount for it, that is wrapped in fiberglass and epoxied to the deck on a bed of thickened epoxy so there are no gaps.

I just put the third coat of thickened epoxy on top of it and the toe to build them up equal across their length. My plan is to drill holes for 5 3/8" carriage bolts (not looking forward to this).

The backing plate will be glass covered oak, bedded with epoxy to meet the curve of the deck. I will have aluminum plate under the oak.

I intended to take pictures of the peice of oak... but forgot. Will take some shots once the project is put together.