Bar on top wing of PT-17?

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Bucksnort101

2nd Lieutenant
5,830
1,081
Sep 11, 2007
Minnesota
Recently went the the Minnesota CAF wings open house and they had a Boeing PT-17 on the Tarmac. It had a "bar" for lack of a better description on the top wing, right down the centerline next to the fuel cap. Was wondering if anyone know what purpose this served?
Attached picture is not the same aircraft I saw, but clearly shows this black bar next to the fuel cap.
 

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