I have removed glued and pinned scales off of fixed blade knives before. used a heat gun on low setting. didn't take much direct heat to get those scales to pop right off. I have glued a few scales on myself always used pins no hidden tang setups though. After seeing how easy epoxy can be defeated with heat and cold I now only use the male/female screws for scales. I would definitley want a pin in a hidden tang knife. There may be super epoxys of military grade out there but I cant afford them and havnt had a knife that used them yet .