Share 'Another broken mandolin neck joint'

Hey everyone! Looking for a little advice. I have a modestly priced mandolin on the bench. The doweled butt joint let go, but the tongue is still attached to the top. The customer is looking for a cost-effective repair (which I understand... the mando probably costs around $250 new). The joint appears to fit fairly well, but I don't want to stress the neck too much trying to pry it open. I would…