Hello there, I bought one of those kits last week, my rear mechanism broke at lunchtime ordered and delivered next morning and back on by lunch............ ! Ok so this was only because My window mech. had broken before I had bought the kit and laid it out and oh boy instructions ! hmm now yes they arnt as straight forward as it seems and yes no room for error as I found out the hard way after cutting them at the wrong stage.....ended up being too short the window did not go up to the top,,,,, made a tempory wire from the left over section....... my repair lasted with the window being used twice and then snapped so had to order a new one, but I now fixed it as I knew where i went wrong first time... got it sussed now...