Rear quarter window issues

Since putting my Duster back on the road last year, I've had the same issue with my rear qtr. windows. When I went out to clean them a while ago, I had a look at fixing them up a bit.
I pulled out the spring clip that's held in with the phillips screw at the hinge, and worked it a bit. I flattened out the back end (behind the screw hole) and closed in the rounded section a bit.
The windows feel a lot better now- they close more firmly, and they actually stay out when I open them. I can still push them closed, but they're a lot better than they were.

edit- drove around for a while, windows stayed exactly where I put 'em.