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My 82A (Avatar March 1929) windshield frame has the offset brackets and the "tube" as described above.
Confirmed/duplicated in another '28 truck cowl (one can't have too many cowls) bought for the NEXT truck cab.
Another loose frame from a pre-1930 car does not have the tube - probably from a coupe or tudor. I expect this may be caused from the header above the windshield being the spot for a vacuum or electric wiper.
Joe K