Just managed to remove the cursed o rings from my car (Look east and spot the blue cloud - that'll give you a location!)
They were really crusted and flat but they've clearly been done before as the front edge of the under trim panel has been attacked in the past. Thanks for the tip on tightening and then untightening the screw - worked a treat!
One question - has anyone got any tips on how to actually get the new rings on the metal pipes. I got the old ones off with a small screwdriver pretty easily but space is severely compromised. I have removed the top binnacle and fiddled with the heater ducting but am really struggling to get access - it really is a piece of crap design.
I want to clean the join up nicely but I've stopped for the evening now before I torch the whole **ing vehicle.
Thanks in advance ;)