Rear shock upper bolt

1975 Duster

Top bolt that holds the shock on the car. It is a stud that has a nut on both sides.

The nut on the side tat holds the shock on to the car came off easily. The other side does not seem to want to budge. Not particularly keen on sticking one side of the stud in the vise so I figure there may be a trick to this.

The manual says remove bolt :)

Thanks
ian.