I have a friend whose garage is filling up with wood Windsor-ish dining chairs with loose legs, rungs, etc. They are by no means fine furniture but he would like them to look nice when he's done. The last time I tried to deal with this (20 years ago) I tried a number of things, none of which were particularly successful:
Glue that swells the wood (it didn't)
Toothed metal inserts that hold a tenon in a hole (they didn't)
Converting a plain tenon into a wedged tenon (hard to do if they aren't through-tenons)
Countersinking a short screw and living with the uglies (effective, at least)
Firing in a bunch of pin nails (temporarily effective, and visually unobtrusive)
Gorilla glue and its friends have been invented since then; would it be any better than carpenter's glue? I know to moisten everything before using it.
I don't think he's going to be excited about the idea of totally dismantling the chairs to start over.
What's the current state of the art in chair repair?