Hi Guys,
Sorry for the massive delay in responding to this, but the poor chap who does the work on my car had his business broken into and most of his stuff stolen. So it's taken a while for him to get back on his feet.
Either way the new rings are fitted and work fine. It appears the old ones had been hammered on by some Gorilla rather than being heated up and put on properly! Why is it so hard in this day and age to find people who can actually do a job properly??!
Cheers
Mark