Dave Sr. from SWISCO responded:
July 27, 2017
I'm afraid I'm not too familiar with Marvin Integrity windows, but I know they have a lot of exclusive parts. You may need to check with them if they have a vent lock made for this window. I don't believe the 26-387 would work because of the side trim on the window. Like you mentioned, you could possibly use a type of wood or sheet metal screw, but the trim on the side of the window looks like it is contoured. you would need more of a square trim to mount the base of the 26-387. We also have the 26-434, which is made to be used with wood sashes. It may be worth considering. Take note of the clearance between the wood sashes, like you said, as well as the depth of the glass, and most of all you will need to mount the base on the wood part of the sash. Make sure you do not screw into the wide glazing bead shown in your photo as you could damage the glass.
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Dave Sr. from SWISCO responded:
August 1, 2017
I'm really not sure. The reach back on the 26-387 is closer to 5/16". If you were to cut the bottom of the lock, you would have a wider base and may be able to make that 3/8" reach. I'm afraid I cannot guarantee this will work, though.
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