Bob from SWISCO responded:
July 13, 2021
Your hardware looks just like either our 39-139 and 39-138 operators, or the 39-141 and 39-142. It depends on the length of the link arm, so please compare and let me know if either set matches up. That said though there is but one key difference between these sets of operators and your old hardware. It looks like you have reverse mounted installation screws. With that in mind, you will also need our 33-205 threaded nut to reverse install the installation screws. I've installed these with the help of a bench vise; you just press them into the holes at the front of the operator base. Let me know what you think. |