Originally Posted by Steve
Did mine last week.badge pops off easily,just slide a Stanley knife blade underneath.Theres a plate underneath with a slot to get to a brass screw,make sure you use a good fitting flat blade screwdriver as its very soft brass and is easy to damage.Its just a conventional thread ie.anti clockwise to unscrew.Once undone and removed you can unscrew the cover to get at the top o ring.
5 minute job.
Thanks Steve I got as far as removing ther brass screw but cant see how to remove the cover. Are the 2 tiny hole opposite each other small grub screws - I cant see any in there or do you need some sort of tool in the holes to unscrew the cover? Hope this makes sense - I have added a pic to show where I am stuck.