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Paul from SWISCO responded:
February 29, 2016
Hey there, Andy! It's tough to make out your operator design from this angle but I think yours may be a good match for our 39-413 operator. Review our dimensions below and see what you think; take special note of the bearing at the end of the arm, as well as the offset. If these details don't match, let me know and I can look into alternatives for you. As for a folding option, I recommend our 39-205 handle. This handle can fold for ease of use and is fully compatible with the 39-413. Please let me know if you had any other questions about these two products and I'd be happy to advise! 
Alternate image for 39-413
Alternate view of 39-413
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Paul from SWISCO responded:
March 15, 2016
The spline on the 39-205 is 11/32", yes. I think this will be the same measurement on your old handle, too. Truth has only ever used the 11/32" size for all of their casement operator parts. I recommend triple checking that just to be 100% sure. |
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Tom from SWISCO responded:
April 11, 2023
Hello! Thanks for reaching out to us. The design of your operator is very similar to our 39-171. It's not exactly the same, but I think yours may just be an older version. Review its specs below and let me know what you think! 
Dimensions for 39-171
The 39-171 replaces this older style crank operator
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