Dave Sr. from SWISCO responded:
May 23, 2017
Compare our 39-138 operator with yours, especially the arm length. This could be the operator you are looking for. As for the screws, you will need to take one of your old ones to a hardware store in you area to see if they can supply. I believe it is a machine screw with a 10-24 thread count, but take one with you to be sure.
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