casement window operator

A home owner from Bloomington, IL says:
I need to replace several casement window operators. They are from a house built in the last 60's. The crank handles have Malta on them. Otherwise, there are no distinguishing marks on the window frames or cranks. The bottom of the cranks have a LH or RH depending on whether they are left or right cranks. You should be able to see the measurements based on the pictures.
User submitted photos of a window operator.
Profile picture of Paul
Paul from SWISCO responded:
You have a very old style operator, but I think our new versions are worth considering. I recommend that you check out our 39-028E and 39-027E, as well as our 39-114L handle and see how well they match your hardware.
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