Dave Sr. from SWISCO responded:
September 15, 2015
I'm not sure what the problem might be. The 39-353 operator base has two holes which the screws pass through. The frame on the window should have threaded holes for the screws to mount into. I would suggest going to a local hardware store and getting the proper length and thread count to go with your window. Another issue could be that the thread in the window frame might have become stripped, whihc would explain why you can't tighten down the operator.
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