Enjoying my beloved 20 gauge flintlock when I noticed the stock had cracked two hours into a wonderful South Texas afternoon. I don't know if the stock can be fixed. Not a lot of meat right there. Oh well.
Worse comes to worse, have it burned out by somebody local that has a laser engraver. Broke the second left hand bit trying to back the first one out. I have a lot of experience fixing mistakes I have made over the years. Hate to drill a hole.
It's probably not stuck very bad, just the tip hung up on the edge of the land, try raddling the barrel on the breach end with a plastic headed hammer, or if you can get the bit to turn just a fraction to the left it should fall right out.