Dave Sr. from SWISCO responded:
August 2, 2016
I believe that you have an older style operator. See our 39-330 for the possible newer style. You would also need to replace the handle with the 39-114L, since your original uses a different type of spline. We also have the 39-205, which is the same except it can fold down. Looking at your photo, I believe you can still use the old sash bracket. If not, we also carry that the 39-554. Take a look and match the parts up with yours to confirm.
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