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Casey from SWISCO responded:
January 22, 2024
Hello, We carry the 39-230 and folding 39-224 handles with a 5/16" hex base. Take a look and see if one of these could work for you. If you're unsure, feel free to get back to us with photos of your operator with the window open so that the arms that move the sash are fully visible, which would help us confirm which handles would be compatible. Thank you! 
View of handle socket
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Casey from SWISCO responded:
January 22, 2024
Thank you for clarifying. The photo of the base helps but I would still like to see the operator with the window open and arms fully visible to confirm the exact operator that you have and which handles would be compatible. The 39-205 or 39-114L would generally be my first recommendation but since you're saying that the spline is 5/16", we'll need to see the entire assembly to get an idea of what might work for you. |
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Casey from SWISCO responded:
January 23, 2024
This is exactly what we needed to see. Your operator resembles the 39-330, which uses the 39-232 handle but keep in mind that the diameter of the opening measures 11/32". We also offer the 39-329 opposite-handed version. Review the specifications from our product pages below and see what you think. 
Alternate image for 39-330
Side profile view with measurements
Dimensions and alternate view of 39-232
Dimensions and profile view of 39-232
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