Tom from SWISCO responded:
November 14, 2016
Thanks for posting! Take a look at our 90-020, this may be what you're looking for. Carefully go over our dimensions and let me know what you think!
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Paul from SWISCO responded:
February 6, 2018
Our 90-273 keeper isn't screwed on to the sash. It is riveted to the frame at the factory. Hopefully you can lower the top sash, pull off the keeper to expose the two holes for the pins on the back of the keeper to slide in and somehow crimped the pins from the outside of the sash frame.
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