^cant you just push the bolt all the way in, then grind off some of the tip?
I'm pretty sure I can get the supplied bolt out (re: will NOT be usable), however it's fitting the new proper sized bolt in that presents the problem.
I noticed on the side of the Knoxx stock there are almost what appears to be 'push pins' that are quite well seated. If those could be removed then it'd be smooth sailing...
...however I'm more than a bit apprehensive to take a hammer and punch to 'persuade' it out!




















































