Ok taken another look and there is indeed a spring clip under the top collar, so removed it and slid collar and spring off
I'm amazed how light the damper is without the spring
Now just to ask the question again, after 5,000 miles and 5 years should I get the dampers checked over, does seem like a lot of use
Once I get it all back together I'm really hoping to improve the handling, it seems to have got progressively more understeery over the years
So I have one way adjustable dampers, 275 & 170 springs, freestyle adjustable front ARB, Caterham rear ARB and run on ACB 10s so why's the balance so crap
Duratec R538 Build and Modification Pictures
here