how to remove bolt that clamps handbrake cable to underbody?

Hi, I need to replace one of the handbrake cables (it doesn't slacken properly when the lever is let off - probably stretched and kinking) Anyway, I have already replaced the one on the other side, so at least I know what I am in for this time! When I replaced the other cable I was unable to remove the cable clamp where it is attached to the suspension. Its in a really awkward spot to work on, so I couldn't get a tool on the bolt to undo it (think it was a torx head) Had to cut the cable off! This time I want to be prepared to do the job properly. What tool do I need? Or any other suggestions? Thanks.

Hi This is quite a good write-up on changing the handbrake cable. Hope it helps Matt

there are two retainers for the handbrake cable one is held on with a rivit and the other with a torx just give the torx head a good clean out before trying to undo it

Thanks Wayne, That's an excellent suggestion. To be honest I don't mind all the other hassle that comes with replacing the handbrake cable. But this bolt is a real pain. Do you recommend any particular type of adjustable wrench?

any will do mate or a pair of mole grips works also. ive also used the torx bit in a ring spanner in tight areas,6 or 7 mm IIRC but u cant get any downward pressure onto the bolt that way. wayne