Re: Stripped threads... no problem
Yes, if you replace the jug, you'll go through a break-in cycle again, as the rings wear down the little bit of hone on the cylinder wall and seat themselves to the new cylinder.
On the thread fix, what do you mean by "small hair pin"? I'm thinking it's got to be a very thin piece of wire to bend with the thread and wedge in there good. Sounds like a great fix! As long as it holds, I don't see why you shouldn't be able to run like that for a long time, but if you need to take that bolt out again, you might not be able to use that trick again.
Oh, one more thing - was it the screw that was stripped, or the threaded hole the screw goes in to? You say stripped exhaust screw.