Dave Sr. from SWISCO responded:
April 26, 2016
Thanks for posting, Ben. This looks to be a very old operator. I don't think we can find an exact match, but I have one idea. Start by looking at our 39-344 operator. Now, this doesn't have the long flat bearing at the end of the arm like yours, but if you replace the track with our 39-504, then you may be okay. That said, due to the age of your old part I cannot guarantee that this will work. Carefully look it over and see what you think.
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