Same as the old style Stihl caps, I never had a problem with them. I also never have a problem refueling. Combi cans are what I've always used, you yanks have a different name for them I think?
I never used a scrench on a oil/gas cap unless some fool has tightened it on before me with one. My 660 has the old style caps, never a problem on or off by hand.
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