A quick learner from Campton. ,nh says:
June 3, 2016
My screens have a plunger style with a spring witch has a 90 degree hook that catches the window frame holding the screen in place
Dave from SWISCO responded:
June 7, 2016
Could you have something like our 70-050? Look it over and see what you think. If this won't work, we'll need a picture of your part so that we can find a better match.