Casey from SWISCO responded:
June 8, 2023
Hello, Your photos resemble the 39-329 and 39-330 Roto operators used with the 39-553 and 39-554 brackets. Based on your description, I'm not confident that your original hardware can be repaired but if the bracket is the issue and is slipping off of the stud at the end of the operator link arm, you can just replace that part and reuse the rest of the operator hardware. Take a look and thanks for posting! Dimensions for 39-554
Alternate image for 39-330
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