just give it a tap with a thin bar and mallet its not thread just the nut end is.
ian
Bmw r1100s 02 frost blue,bmw r1100s 03 blue,Yamaha tmax500 03 silver
Honda fireblade rrx 98 orange and bronze,aprilia rs250 01 black and red,aprilia rsv milie 99 black and silver
And if it's not too late already - put the nut back on a few turns before giving it a clout. That stops the end threads getting mashed up. I find 1/2" extension bars good for this sort of thing instead of trying to get into the bolt with a hammer and you don't risk damaging screwdriver tips.