Tom from SWISCO responded:
August 28, 2017
Hello Rick. Your operator looks like it is from an older Silverline Awning window. I would like to recommend using our 39-025 awning operator as a replacement. Your link arm is longer, but the travel in the gearing should make up the difference. As for the thread hole you have at the end of the link arm, our 39-025 has a threaded sector that make up for the shoulder screw you would use in your operator.
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