I would advice against using epoxy unless you disassemble and clean the parts. Epoxy is incredibly strong stuff and had great gap filling property but it's adhesive strength is very poor when used on contaminated surfaces or some incompatible materials. In this case even if you manage to get the epoxy into the crack n good quantity (epoxy is one of the worst in this respect except some very thin varieties) and clamp it, the epoxy will just fill the space between lots of glue and filler. So you'll be basically gluing the failed filler and glue back together and not gluing wood to wood. I've handled enough of these mandolins to be pretty certain the neck was fitted pretty roughly into oversized mortise and secured in place with pins and lots of glue to fill up the space. Any final gaps filled with putty and finished over with the opaque poly lacquer. You may hope yours is better but I wouldn't believe untill you look inside.
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