Bar and chain flew off because you didn't tighten those two nuts.
The new Stihls have a single dial wheel that tightens the chain instead of the old traditional two nut set-up.
Was out today cutting about a dozen trees blown over. My dad showed up with his stihl. Newer POS with the plastic crap. He did 3 cuts and threw his chain. I hate that set up.
I like my echo cs400. No problems. I actually had to grab the cs800 36"er for one tree.
