SebOBC

I did this last weekend and found that the video was a great help. Only thing I would add, is that to replace the outer white round plastic inserts that hold the window to the mechanism I put a screwdriver thru their centre with a socket behind the insert. This allowed me to centre the insert and then tap the socket with a screwdriver to push it home. For the inner insert I put it on a long woodscrew as this gripped without opening it up and just pushed it straight into place and undid the screw.