Yer did that!
Managed to get it off in the end just couldn't believe how much force you needed to get the top bit off!
Next problem was the foam insulator stuff oh my god I cannot believe the stuff they stuck it on with got half of it off then gave up.
The reason I am doing it, is because the windows sounds really gravelly going up and down and doesn't quite go all the way up and I can't figure out if the regulator is on the way out or it has a load of rust in it!
Does that sound like regulator symptoms?