casement widow operator

A home owner from Traverse City. MI says:
The operator for this casement window is stripped and will not open or close the window. The part is stamped "Standard-Themson Corp, Dayton, Ohio, USA, Patent Pending"
The operator arms are both 16" long.
The house was built in 1954 and the windows are perfect other than the 2 units are that the stripped. We know we may not be able to get an identical part but will try anything.
Thank you!!
User submitted photo of their window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Hey, Lauri. Unfortunately, this is a very old operator that is no longer made. The manufacturer recommends attempting to substitute with a newer operator like our 39-389 and 39-386 handle. It's not an exact fit, though, and may require some measure of retrofitting.
A home owner says:

Let's hope it works and I will order more of these.
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