Lower control arm pivot nut - how do you stop the pivot shaft from spinning?

Im doing a front end rebuild and am left with the LCA pivot nut which just spins the shaft when trying to remove. I left some tension on the torsion bar but that doesn't seem to help. I can't see anyway to hold the shaft still. Based on the other bushings, this one is probably non existent too. Any tips/tricks on removal of the nut? Thanks in advance.
I've used vise grips to hold it