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I appreciate your reply. I've been doing lots of research and you are correct, that bridge helps keep the rings in the piston. Sadly it seems most of the smaller Mac saws lack piston ring pins. I really just needed a light one hand saw and this fit the bill pretty well. I just kinda felt...

So while stopping in to buy some chainsaw parts for one I was working on for a friend I ended up walking out with two complete power Macs. They're both later variants with the auto oiler, one has a chain brake. Both have low compression and would randomly lock up. The first one without the...