Paul from SWISCO responded:
January 19, 2018
Checking with our supplier, they tell us that the IWC sash lock that you show in your photo is no longer available. They suggest using the 90-313 sash lock and remounting the holes at the top. You will need to use a screw similar to the 33-011 . Be careful, though; you don't want to use too long of a screw or drill too deep. You could damage the frame or the glass in the sash. Choose wisely. Do you think you can manage this modification?
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