An update...
I spoke with Caterham, they were very helpful. The solution was simple, the dial is simply very stiff and and held in place by a spring loaded grubscrew, it was suggested that I use pliers to turn it. I did this but found that a small screwdriver could be used too.
The range of adjustment is very large for only 5 settings (CC warned me about this), these are my observations.
Setting 1 - the suspension bounces around a huge amount (very soft), I don't think I would ever use this setting.
Setting 2 - is acceptable for bumpy/rough surface roads but didn't feel good on roundabouts and twisties (soft), felt a bit like my MK1 MX5.
Setting 3 - seems like the best comprimise for my local Dorset roads (firm)
Setting 4 - this was the setting my car was on since I bought it, on some roads my fillings were working loose but it felt like I was cornering on rails (very firm)
Setting 5 - I need a good (and cheap) dentist, more suited to driving on glass or the track, so I'll try this at a track once I get the chance (hard).
So with only 5 setting it's very easy to find one that suits me.
I am Leg End...
Edited by - Andy Whittle on 26 Aug 2008 13:01:21