QUOTE (andy2205 @ November 23rd 2008 5:29 PM)

If the castle nut looks like this, you may need to remove the staking (use a small punch to knock it back). It it's not staked, try what the others said and heat it up and turn it with the proper spanner wrench.
staked castle nut
That is what I was going to ask, is it staked? I have never had to heat mine up before, I guess I was lucky.