Hi Matt
Thanks a lot for your help... Followed your instructions and also removed the rear speakers to make it easier. Toothed nylon strip that sits inside the motor/gear was broken at the end. Mercedes UK dont sell it seperately, so I glued it, but it broke again.
Luckily enough there was enough strip left for the blind to operate fully up and down, so all fixed.
Thanks again for your help, much appreciated.
Shane