Question concerning '68 Dart vent window rubber seal

Heres pics/instructons from our 69 Plymouth FSM. The adjustment I'm talking about is the bolt at front bottom of door. "Fore and aft". I "think" this helps adjust the verticalness(I made a new word) of the chromed vent frame assembly?? Finnicky as fack to adjust doors and glass. IMO sealant would look like crap.

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