Ah ok, thanks - my snow chains fasten onto one wheel nut, so although i dont need to remove the wheel i do need to remove one wheel nut cover on eachdrive wheel...i'll give a crocodile clip a try - there is no official removal tool in the spare wheel in the car. I used a bit of wire to fiddle one of them off but that's scratching the Wheel itself and is way too fiddly to do half way up a mountain in a blizzard (which is where i'll no doubt have to fit the snow chains in the Apls next week)