Fish - thanks for the idea about wristbands, handn't thought of that, know what you mean about rotting rubber bands. Fortunately, with the amount of junk mail I get, I always have a freshs supply.
Nice thing about pop rivet is that there's nothing to lose. Also, if you have the tool, a little easier than cutting threads with a tap. If I were going the screw route, I would use thumb screws rather than flat head screws, that way I could tighten down the angle without using a coin, or whatever. Thumbscrews are butt ugly, though.