Here's the thread. See post #39 for a view of the template.
http://www.spearboard.com/showthread.php?t=55829&page=3
Someone correct me if I'm wrong, but I think that is a Poseidonsub mechanism that Prater used. Neptonics makes a trigger mechanism called the "Reef" model that is very similar and also has a resetting line release that works the same way. I "think" that Josh also offers offers a template to aid in positioning everything.