New to the Forum.  I purchased the Trail Tech speedo and I'm having some issues.  I cant get the hub off to hook up the speedo cable.  I have the 2007 450 and the hub is held on by 1 big nut.   The threads on the axle has a grove in it and the nut has a lip on it that was punched into it.  I've tried to tap it out and break it w/ the impact gun....but I'm getting no where. 

Has anyone else done this?  Any suggestions?