Great series of vids on the moggie and very enjoyable to watch. Keep then coming. Following closely as I am also on a rolling replacement programme with various bits on mine!
Sorry I didn’t film it. It was a bit fiddly. Pull out the old rubber (mine fell to bits so that was easy) then you should be able to see how to get the quarter light out. You do need to take it out I think as the swivel mount for the quarter light goes through the rubber rather than around it. You may need to take the wing mirror mount off and part unscrew top of window frame too. Good luck!
Did you have to take the window frame out to remove the quarter light to replace the rubber that goes around it. I'm planning on doing mine soon and heard that's the only way to do it. I'm not looking forward to it.