The window swings or the latch ? if it's the wing window That's fixed by tightening the spring on the bottom of the vent window inside the door . you have to remove the complete vent window assembly and be very careful to "open" the shaft nut stay and use your favorite flavor of rust buster before trying to tighten the nut as the shafts can break. if it's the latch your missing a convoluted washer
