casement operator with missing crank handle

A home owner from Lebanon, NH says:
Help! I have an old casement window operator with a missing crank handle. There are no markings whatsoever on the mechanism. The arm measures 12" total, the track is 13 1/2" The crank mechanism is a 1/4" square drive (female)and therefore requires a 1/4" square drive male crank handle.
The other odd and perhaps identifying thing about the operator is it is symmetrical and can be used either left or right handed (there is a drive hole on both sides of the housing)
Thanks so much for you time,
User submitted photos of a window operator.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Your operator looks like our 39-268, which takes a 1/4" square shank handle like our 39-347. Take a look at this hardware and see if that is the one to fit your operator.
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