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The problem with the pop rivet is that either end will be too bulky once installed. Even if you manage to shave a little off the end of the tube, I have a feeling that the other side will have a hard time sliding past the rubber when the vent wing is closed. In order for the pop rivet to remain tight, the "ball" end of the shank snaps off inside of the tube keeping the tension on both sides of the rivet. If you remove the "ball", the rivet will loosen up due to the fact that the wall of the tube is very thin and therefore not very strong.
The only solution that I can see as of now is to go to an old time hardware store or fastener warehouse and purchase some real solid rivets, not pop rivets. Aluminum rivets would work fine. To install them you will need to place the rivet in from the bottom side just as you have shown in your photo. Then place the face of the rivet against an anvil of some sort. The top of your vice would work. Then use a punch or a drift and a hammer to strike the protuding end of the rivet peening it down until it "mushrooms out and becomes flat enough to install on the glass. If you can't get it all the way flat, you could file or grind just a bit off until it clears the glass. It would probably be helpfull to have a second set of hands hold the part while you do the peening.
If you have a hard time finding the rivets, let me know the diameter of the hole and I will send you some.
Another option would be to JB Weld it into position. Once the glass was installed, it won't move around at all.
Chris
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