Awesome thread. When I first saw it, I said what the hell, but now reading this, this is some great info. I have seen many of these specimens at flea markets, and can say I don't know anything about these. The one in the picture looks like a beast, a child eater. Though my old workhorse Stihl out in the garage is saying to me right now "Don't you get any ideas"................
give it a try. it's really fun, once you've seen to it that the saw is properly set and sharpened. if not, you'll never want to make the transition over from those nasty, sputtering, internal-combustion machines......................
-ben