What about the tangs ? They are what holds the stock to the receiver - you don't do anything about them. The wood bends behind the tangs. The gun is clamped down - a clamp on the receiver , and one on the barrels. Then pressure is applied to the butt of the stock after heating the wrist area. I've never bent a stock with through bolts. I believe it's done, modern trap guns are bent all the time, just never saw it. I've been told the through hole has to be enlarged. Paul