maybe this will help drill 2 1/8inch holes one on each side of your skull ,then i took a piece metal about an ich wide but strong enough to hold the antlers and the plague. i made it longer than the inside of the skull about 1 inch, or more.then i bent the ends , like this [ then slid it in the skull and pop rivot it on both sides , then simply mount it to your plague using 2 screw or 2 nuts/bolt.the only thing you see it to smooth rivots. hope this helps if you need me to i can post pics