Plastic screw in corner

A professional from Pennsylvania says:
October 15, 2018
Could not find any marking on frame
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Paul from SWISCO responded:
October 15, 2018

It appears you may have a Cook window. Many parts for this type of window are no longer available, but we do offer a few items in our inventory. The part it seems you are looking for is our 17-074 bottom tilt pivot. Take a look and let us know if this part will work for you. 
Bottom Tilt Pivot
Bottom Tilt Pivot
17-074
$5.70
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