I have repaired these by placing a threaded pin or small ridged nail (like a paneling nail) across the crack (in a channel cut by a dremel tool)on the inside of the stock if the crack is visible inside. There is no need to pin a stock from the outside if you can see the crack inside. Way too many guns were repaired with dowels through the head of the stock. Wouldn't hurt to send us a photo of the cracked area.