This is a friend's cheapo guitar. His dog knocked it over and the head broke off. He offered me money to try and fix it so here goes.
I ordered the often mentioned West Systems epoxy products from Amazon. $82 bucks.
West System 105-A Epoxy Resin,Clear
West System 206-A Slow Hardener
While I wait on that, I see the bridge was lifting so decided to pull it off so it can be re-glued.
Surprise #1. The bridge plate was cracked in half.
Surprise #2. The bridge plate fell off when I took the nuts off the bolts coming down through the bridge.
Surprise #3. Fairly sure the plate was cracked and separated when they tightened those bolts during install.
The bridge came off pretty cleanly but surprise #4, I thought it was a solid top.
The neck break doesn't seem to worry me as much as the lengthwise crack below it. The head fits back on decently and if the epoxy holds, it holds. But the lengthwise crack has movement so am not sure yet what I'll do about that.
Surprise #5 is that the neck is set perfectly. No need to for a reset.
I'll make a new bridge plate and glue it in. I'll then route the top layer of spruce flush so that the bridge fits nicely in the pocket.
This following advice was from Diane. I already used my "phone-a-friend" card for today.
I'll post again on the bridge and plate repairs and then on how the epoxy repair goes as well as any finish repairs.Just use the old plate as a template and make a new plate to glue in. Just use titebond and plenty of it. Make it the same thickness as your plates. Allow the Titebond to start to tack, to help you hold it in place. Use tape to hold it. You can drill 2 tiny holes, which would be hidden by the bridge, through the plate and top, and run a low E string through it, pulling it up tight, through the holes. But you'd have to be accurate on the placement.
Use your inlay tool and rout out that first layer of wood. Just inlay the bridge in the footprint.
This gives you a couple of advantages.
1. It's a natural glue dam
2. You don't have to worry about the bridge shifting while gluing
3. You'll have a pristine glue area. Just use titebond. Use plenty of glue so you get good squeeze out. You'll want to clean as much of the squeezeout as possible, with a wet paper towel. What little is left will clean easily off of the finish after curing.