How do I remove the window handles?

[Blu_Hwy_Lady]

The window handles that tilt the windows open on my '72 Safari seem to be permanently affixed so there is no way to remove the screens. There's a tiny hole in the handle but the thing that attaches the handle to the lever is neither a screw or a rivet. It looks like the only way to take the screens off is to cut a small slit in the screen frame and slide it around the handle. Since my grandmother always warned "never cut what you can untie" I'm reluctant to cut the screen frame.

The first picture is of the handle. In the second picture I muscled the handle around with my vise grips to try to unscrew it. That didn't work but it did make it possible to photograph the mystery hole. (pointed out by the red line)