Tom from SWISCO responded:
September 23, 2014
Thanks for posting! Yes, if the gear screw comes out then the whole operator needs to be replaced, unfortunately. This looks a lot like our 39-031 and 39-032. Have you seen these yet? I think they closely resemble your own parts, but just double check the arm lengths. If you also need new covers and handles, see our 39-107 and 39-114L, respectively.
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