Back gasket system - Fit E11 the glass MK42 and NW1 NW6 beads as SE25 described above UB6 and [https://www.repairmywindowsanddoors.co.uk/kempston-windowrepair/ Mk42] then push N20 the rubber gasket back into the frame Ox28 by the inside of GU34 the MK42 window.