A contractor from West Burlington, Iowa says:
June 21, 2016
We are having a hard time identifying these windows. The latches have broken off of eleven windows total.
Tom from SWISCO responded:
June 22, 2016
Thanks for posting. It looks like the thumb lever has broken. We have many different kinds and I'm not sure what to recommend in your case. Could you tell me the size of the forks at the bottom? I will need to know how far they stick out and how far they're spread apart from one another.