It turned out much easier than I thought it would be. Here's a short summary of the steps:
1. Get rid of the soft plastic cup that came with the original, its much too small for the Aquatica port.
2. In its place slip in a hard plastic disc that will align the lens at the center of the port.
3. Glue the pieces in place.
4. Mount with rubber band and Velcro strap. Given how light it is, I don't think anything more is needed.
First I apologise for not having the foresight to take photos of the parts before gluing it together, but it's simple and pics of the finished product should be enough to illustrate the process.
Here's the fitted diopter looking in from the "water" side.
Here's the view from the port side.
The ABS plastic disc that's fitted to the slot in the lens has outer diameter 4 3/4 inches and inner diameter 3 1/4 inches and is 1/8 inch thick ( apologies for the units, you'll have to do the conversion to civilized measures yourself ). It was cut in halves for assembly and glued together with the pieces on both sides of it.
Here's a closeup of the edge
Here're views of the nano Pocket Woody with the port.
The pieces used to glue it together are cut out of a ring of the same material that's 1/4 inch thick and 3 1/2 inch inner diameter and 4 4/3 inch outer diameter.
Total cost of the project is around $35 not counting the cost of the lens itself, most of it is labor at the local shop, Tap Plastics, for making the parts.
The way things fit together, it would be easy to stack multiple ones of these. I'll try this out a few times first and see if that's worth doing.
