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Casey from SWISCO responded:
July 3, 2023
Hello, Your operator looks like an older version of the 39-171 and 39-172 depending on how the dimensions compare to yours. If your link arm is shorter, you have two options. You could move your sash bracket to compensate for the difference in arm length or swap the arms altogether. This can be done by drilling out the new and old link arms, then installing the old arm on the new operator using our 62-014 rivet. To install this rivet, you'd have to hammer it in; I recommend doing it over a metal plate if you have one. Review these options and see what you think. Thank you! 
Dimensions for 39-171
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Casey from SWISCO responded:
July 19, 2023
We have recommended the 62-014 rivet to replace the link arm for various Truth operators and we have never had a customer report that it was too big. With that being said, take a look at the image below and feel free to get back to us with the exact dimensions needed for your application if you're still concerned. Thank you. 
Dimensions for 62-014
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