UPDATE: To My Flag Pole. Change my flag holders to be used with

https://www.printables.com/model/195597-flag-pole

“fiberglass marking stakes” which they are ¼" Dia. (About 6.5mm). They are Glue to the holders. I used hot glue so if I need it I can remove easy.  Or you can find something else.

What it makes that when is windy the stakes can rotate both holders together. With out them so many times ends of the flag are getting twisted.  

I included a spacer that goes inside the rivets of the flag so it will prevent bending brackets when tightening the screws.

There are STL and Step File included.