Hi all --
I've completed my installation of spacered inwales on my dory -- and I wanted to describe my method, since it deviates significantly than John's description on the site. This works for new construction -- I don't know if it could work for retrofits.
1. Before the outer rails are installed, I glued the inwale spacer blocks to the side of the boat. I don't think this affected the curve of the side, since the side still seemed quite flexible once the epoxy set. Note that I had already installed a modified breasthook and quarter knees to accommodate the inwale.
2. I then epoxied on the first layer of outer rail, clamping it by screwing it thought the side into the spacer blocks. This faired the curve of the side. After letting the epoxy cure, I removed the screws, and extended the 3/16" clearance holes through the spacer blocks.
3. I then cut the inwale to length, leaving it very slightly long.
4. After clamping the inwale to the stern quarter knee, I 'snapped' it into place. No glue applied yet. (I had sealed the inner surface of the inwale with epoxy.)
5. With the inwale in place, and working bow to stern, I injected thickened epoxy into each clearance hole (about 1 mL each), and drove a inch-long 3/16" dowel into the hole. (I had tapered on end of the dowel with a pencil sharpener.)
6. After wiping off the squeeze out, I clamped the joint. (I had applied blue tape to the bottom of the joint to minimize any dripping into the boat.)
7. That's it. It is a fairly calm glue-up, and you don't even need to finish it in one day -- you can take a break.
I have pictures on the process on my google album:
https://goo.gl/photos/kvLCqExcr1UNvWMh9
Start with picture 19 or so.
Dave Metcalf
Charlottesville