Dave Sr. from SWISCO responded:
May 20, 2015
I would suggest installing some washers along with longer screws under the "sweep" part of the lock. You could also install a piece of wood, maybe like a painter's stick that you get when you purchase a gallon of paint. That should raise the active part of the lock, making the window a tighter fit when sash is closed and locked. We also carry a lock similar to yours, our 90-027. That may be worth considering.
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