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The flat spot acts as a rotating valve to close/open the intake and outpout holes of the pump's cylinder. Somewhere on the small shaft a ramp/came makes the shaft moves axially while it's rotating. The both combined give the pumping motion. No check valve, very simple system. It looks like the...

If you want a shitty looking saw with a hack paint job, do it on the stihl. It will look like shit but at least it's still a stihl. ;)