I had a Silvertone come my way that had the neck loose, the only thing really holding the neck on was the fretboard, the dovetail was loose. I had to glue a sliver of wood to both sides of the neck. Their idea was to have a real loose fit and slop hide glue in the joint. Should have documented it more.
Marking the neck position to help in lining it up again.
Removed neck using a razor knife and spatula, it was not too bad as the joint was loose.
Cleaning the old glue out. Made a shim out of a piece of oak.
Getting ready for glue up.