Casey from SWISCO responded:
February 27, 2024
Hello, The 39-104 measures roughly 3-5/8" overall but it could still work as long as the 3/8" opening will fit your operator spline. If you're unsure, feel free to get back to us with photos of your operator assembly with the window open so that the arms that move the sash are fully visible. That would help us confirm which handles would be compatible. Thank you! Close up of the gear hole of the 39-104 window operator crank handle.
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