Vent window latch loose

[jermasaurus]

Is there a way to take up the slack in the latch for the vent windows? Or maybe I could just stick a few washers on the outside part of it? With it being nice out I would like to use the window but it always leaks air and whistles if I don't jam quarters in the latch.

By the way, how would I go about removing the latch? It looks like a roll pin is in there, but I didn't want to go just breaking things and making it worse.