Air Filter bolt washer....which way?

I was looking at a friend's bike today and noticed that the washer on his air filter mounting bolt was installed opposite of mine. The cupped side of his washer was facing away from the filter, and mine was facing toward the filter (sharp outside edge facing filter). The service manual is of no help because it doesn't show the cupping or which way it should face. Which way is it suppose to go?

Edges face away from the don't want to cut it, do you?

Hasn't cut the filter yet, but makes sense. Will flip it over. Thanks.

I had mine with the edges towards the filter. I don't know if it was right but my thinking was it would help seal against the filter better :)

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