inside track on a spring holds window up and where window is opened to it measures 1 inch wide and 2/1/4 inch long with a screw on rear to adjust window tension was bought from home depo some 20 years ago they don't know who made it or any manufacture marking on window or sash thank you Ed
Tom from SWISCO responded:
June 4, 2018
Thanks for posting, Ed. This looks very similar to our new 20-022. Look it over and let me know what you think.