My vent window won't stay open...

Once out of the car, I've had good success simply dimpling the half round section of the metal strap someone submitted a picture of. It does not take much of a tweak (dent? dimple?) to make them tight again. I've had difficulty using shim stock due to my inability to find material thin enough to not bind the pivot once the strap screw is tightened if shimming the pivot post only. Sadly on these '63-66 abodies the vent wing assembly does have to come out of the door shell to make repairs.