i followed that link, but I'm not 100% sure Im doing it right. I layed the engine on its side with the boss/shaft sticking out the side. I stuck a club-hammer under the boss and gave it a few light taps with another metal hammer.. no budge.. not sure if this is a slip on type or threaded (if you can get threaded). im a little hesitant to hit harder in-case I damage the boss

I've got a butane torch here.. dont think it'll be hot enough to heat the boss up though..