I have had a hell of a job getting these off... the tyre place I went to had to hammer the socket over the caps to get it on; I presume they were using a 27mm. When I later serviced the car myself, the wheel brace in the car was very difficult to get on and when I tried to undo the nut using an extension bar over the wheel brace it bent the wheel brace! Again I went to a tyre dealer to remove the wheels and they scratched their head a bit before hammering a 27mm onto it. I decided to get my own socket and ended up with a 28mm hex because it was the only one I could get on over any of the caps. If I use this, is it likely to cause irrepairable damage to the caps does anyone think? I couldn't find a 27mm that would fit all of them. I'm guessing this is the corrosion problem mentioned above.