Dave Sr. from SWISCO responded:
October 18, 2023
Hey there, Thanks for reaching out! I have personally worked on many Andersen windows, but not one as old as your. However, I do believe we can still help! You could also try to use a newer version Andersen Operator like our 39-094 (and its opposite handed version 39-095). You'll need the 39-286 crank handle. Take a look over the dimensions and see what you think. Dimensions for 39-094
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