same happened to me last week. i posted on here a while ago about where to get replacement caps as mines got knicked. I bought aluminium one's from ebay and they were still there 2 months later - now I know why, because the little
probably couldn't get them off!!
I took out two pairs of pliers to grip the valve stem and valve cap and still can't get them off!
how much is it going to cost to get replacement valves if they need to cut off the caps???