Tom from SWISCO responded:
June 22, 2018
Thanks for posting! Your hardware looks just like our 39-139 and 39-138 operators but with one key difference. 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! |