Dave Sr. from SWISCO responded:
May 15, 2017
I believe you are showing the take out screw, which was used on older Capitol windows. They used a balance like the S370-18. You could also have the rubber take out stop, like our 59-001, which covers up that screw. I suggest using a sheet metal screw similar to the 33-022. This screw is only needed when removing the balance from the window track.
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