What's the deal with champion?

Oklacarcollecto said

No need to cut the washers because the will unscrew down the threads of the spark plug.

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On one I had to, I got all but one with the screw on type. The 6th one had a different style.

The car seems to have woken up a bit with the washers removed. Also I found oil inside the spark plug tube with the washers installed....that's another reason not to use them.