I have an Anderson Venting Roof Window in my attic that I'd like to get through for some roof access. I believe it is an RV model, as seen on pg 11 of this Anderson parts catalog
I've removed the operator cover, but I can't see a way to disengage the operator arm from the sash. There is a slot in the center of the sash rail that it appears the arm shoes should fit through, but there is no play in the arms to move to that position.
I even removed the center screw (was in the dark hole at the base of the two arms) but that didn't give any additional play whatsoever.
Below is a picture of the window fully open (approx. 8 inches). How can I get the window open further?