I am looking to do a very simply euro mount for an aoudad skull. The plan is to use a shelf bracket attached to the wall, bend the top down about 45 degrees, and have a carriage bolt from the spinal cavity of the skull secured through a hole in the bracket with a lock nut. What type of epoxy would hold the carriage bolt into that spinal cavity? The area I am trying to fill is about as big as my thumb. Thank you.