55-109: how is it rolled?

A handy person from NJ says:
It looks to me like the spline is not symmetrical and has a small flat tab on the one side. Does this tab go more towards the center of the door, or towards the edge of the door?

I am referring to spline 55-109
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Paul from SWISCO responded:
The small flat tab is rolled into the inside of the screen.
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