Technical Bob McGee roadster door question

Thanks to Pete for the answer to the hole in the hood side question,Can anyone(Pete please feel free to answer again) explain the hole in the top of the doors towards the front of the doors? Thanks Ken

 

Side curtain hole

 

The side curtain had a small ( 1/4 in rod, I think ? ) frame , sewn inside, that went in holes on top of the door, both front & back.
A stock '32 only has a hole at the back .
The side curtains have a pleat at the front that fastens to the windshield post & folds as the door opens & closes .

 

Thank You,again we appreciate you and your willingness to share info. Ken