you sure??? its a 3mm allen screw. if it is rounded then you should be able to tap a small screw driver into the head and allow you to adjust it.also its well worth talking to someone like kais re your weight and the spring weight.

Yep, looks like someone has used slightly the wrong size allen key and it has rounded most of the sides off, there is only one sort of straight side left.

That will be coz when it's fitted u can't get at it!! One of the worst designs ever on a shock.

It's now with BG Motorsport at Silverstone. Turns out it was just the allen screw that was damaged as it passed the dyno test. Only £8 for the screw :D The guys there are giving it the once over and setting it up for my weight:D