you need to "hook" it in...
the ball on the end of the white stick that pokes out slides up into it's housing. Kinda hard to explain, but just pushing it back in straight won't work. You need to angle it down then slide it in then pull up so it goes into the horseshoe from the bottom open end if that makes sense... once hooked in then put the clip in and twist to lock in place.
good way to test to see if you have it hooked or not is just lightly push on the back of the bulb housing while looking at the cluster from the front. It's flapping about then you don't have it hooked.
Ah that will be why, i was just trying to push it straight in.
When you say "once hooked in then put the clip in and twist to lock" what do you mean by "clip" the actually unit or should there be a clip somewhere ?
Rhino - how do you do it without removing the light ? just angle the stick downwards then when its in pull upwards ?
Thanks for your help its appriciated - i was feeling an expensive bill :|