I fly Froggy the Gremlin! You've reminded me that I lost it last November and need to make a new one. I think my setup will be perfected this time and I won't lose another one. I attached a clevis pipe hanger WP112848 Clevis Hanger - Grainger Industrial Supply
around my frame with a 1/4" compression fitting through the bolt hanger hole (had to drill it out a little). My flag will go on a 6" driveway marker fiberglass pole with the compression ring and nut on the end. Thread the nut onto the fitting and it should be a solid mount. The last one failed because the compression ring was a little too large so I put a few wraps of electrical tape on first. When it got wet and windy, it managed to slip off. This time I will crimp it or something instead of using any tape.
Hope that helps someone. Thanks for the reminder!