Paul from SWISCO responded:
December 6, 2016
The 26-393 pair, as well as the 26-266 and 26-267, are both used by Silverline window company. The 26-266 and 26-267 tilt latches have a narrow tip, but for the 26-393 they added an extended side. The reason for this, according to them, is that it gives a tighter fitting sash in the frame. If you want, you can file down the side to help engage the tip in the window track. I've never personally done this, but this is the first solution that comes to mind. It may be worth considering.
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