I have yet to figure out what your discribing. If, you are talking about the square box that sits over the gear, that is removable. It was never nailed,screwed ,or glued. But if you have painted windows,it will be difficult to remove this. This cover should lift straight up. Try cutting the paint where the box comes in contact with the frame. Also,it is very fragile. First,find out who made the window,contact them,and find out if they can replace it. You will never get the screws out your way because if you only have 3/4" opening,the screws are going to be 3/4" long. As far as I know all casement windows have a cover like this. Please post back with what you found out,don't leave me hanging. Ron J.