Tom from SWISCO responded:
April 21, 2017
I agree, this is likely either the 39-094 or 39-150. I can't make out your arm length based on your picture, unfortunately. You may want to remove it to get a more accurate measurement. I'm confident it's one of these two operators.
As for the screw holes, I wouldn't worry about it. Some older Andersen operators didn't have them, but it shouldn't make a big difference. |