To be honest, Ken, when mine broke, I headed down to the hardware store and bought a length of all-thread and a pair of nylocks and drilled it out. That's the way it is now, by the way, and I have the "stock" bolt that OS sent me in the spare parts drawer. I also drizzled a drop or two of locktite on the threads. It ain't coming apart any time soon. And, the allthread I got was standard (vs metric) and slightly larger in diameter than the stock bolt, so I presume it's stronger.

Only problem is that the hole in the muffler is no longer threaded (drilled out) so the stock bolt will not work on that particular OS 1.20 AX.. but I have two others, and a spare bolt... just in case.

CGr