Hi Keith, I have the same problem on my abbey 214 gts. My service guy informed me the spring was adjusted up to the limit. The only way forward is to get a new spring, or new blind. Trouble is the van is a 1991, bought 2nd hand, dont know make of blind, or where to go and get a new one. I have decided to take the spring off, and take it to a spring manufacturer, and get him to quote me for a 1off. If I get any joy, I will post you. Of course yours may not be the same problem. Meanwhile best of luck.