I got the drill guide today. The design is very cool - several useful features you probably won't notice just by looking at it. Unfortunately the quality is typical CCC (Cheap Chinese Crap), but it will do the job. Like Dan says, a picture is worth a 1000 words - here it is, and my plan on how to use it:
I'll use the backing plates
as templates, and set them on a piece of plywood
so that the holes go through the deck
parallel. Here I shimmed the plywood
mixing sticks to keep it from rocking on the deck. I also used sticks to shim the base of the drill guide to compensate for the thickness of the backing plate.
When I am ready to start putting the hardware
back, I'll pre-drill the first hole through the plywood so I can peer down the hole and make sure it is centered over the epoxy plug
. Then when the first hole is drilled through the deck I'll run a bolt through everything so the plywood can't move when the drill cord drags under it, or or or. You know how things go wrong.
I can also use the drill guide to make a little jig when I need to drill holes closer to something than the base of the drill guide allows.
I'm not going to pre-cast holes any more using straws or wax-covered bolts - not only is it a hassle, the surface of epoxy gets that waxy bloom when it cures and I'm not so sure that sealant
sticks to the wax as well as a fresh cut surface.
I'm waiting for some back-ordered bronze bolts for another part of this project
before I can start re-mounting hardware. When I get going, if something interesting comes up I'll post it.
Thanks to everybody for your comments and input.