ok, thanks Eddie, that's the last on this subject!
I've ordered a new one!
Cheers
Mark

Ah not so fast.
Just looked at a couple of tyre fitting videos and they seem to advise tightening the rim lock at the pressure used to get the bead to sit. I suppose everyone starts getting their own little ways but its always worth listening to professionals

http://www.youtube.com/watch?v=t8-1aAc1jPU

Nice one Eddie, the vid was great.