i would take the hinge of the frame and not the window , take the screws out of the bottom hinge first but not all the way out , you will need help holding the window , till your ready to lift it out , and it will be heavy, , and mark the hinge with a marker , so you can but it back just at it was , so it will close in line and all the way to its seal , get the right size alen key. first ......
mick, September 2009