Dave Sr. from SWISCO responded:
December 4, 2014
This is a tough one. I believe you will need to use our 39-027E operator, as yours is no longer available. Keep in mind that you might need to modify your wood sill cover to accommodate the newer design. You would also need a new track and handle, so see our 39-114L or 39-205 handles and 39-533 track. Let me know what you think.
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