Here's a 1950s Framus Black Rose with a broken neck, which had been the victim of a poor attempt at repair by persons unknown. The neck had been re-glued CROOKED, and IN THE WRONG PLACE and then SECURED WITH A BOLT which was irremovable thanks to being sealed in resin! (see fretboard restoration)

Since the Epoxy Resin could not be dissolved or re-broken, so I had to resort to sawing through the old 'repair'. (Don't try this at home!)

A rather radical procedure, which did fortunately yield two good, clean surfaces to work with.

The filler was sanded down to blend in with the contours of the neck-heel, then resprayed!