Originally Posted by Jeremy_H

This is a big ol thing

If you get the glue in thread thing again, take a suitable bolt and put a hacksaw cut in the thread end, straight down the bolt. When facing the end file the left side of the bolt on each side, that forms a little tool that can be used to clean out threads if you don't have a tap to suit. Drill out the blocked thread with a drill that suits the core diameter (diameter of the bolt across the bottoms or root of the threads) first if you can.