I'd be inclined to auger out a bit of wood, then dovetail in a bit of aluminun and glass that goes well past the crack on each side. Aluminum would be easy to workup with garage level tools. Given that I will not tolerate failure while hunting, I'd do the absolute best fix you are capable of generating. Good luck, 1Minute

Last edited by 1minute; 03/19/08.

1Minute