Frameless Window ModDisclaimer: This guy leaves out an important step and by now has most likely shattered a window. The plastic spacer needs to be cut shorter and reinstalled to limit opening to 7-8 inches, not totally removed and tossed as in the video. If it's totally removed as he does it will allow the window to swing open so far that the top edge of glass will bind against the aluminum extrusion. It takes some experimentation as to how short to trim the spacer for maximum opening without binding at the top which is based on overall height of the glass itself.