anyone have ideas how to tighten castlenut onto ball joint?

[dhughins]

I've been doing a front disc brake swap from ECE since last Friday. I'm having problems with the driver's side Castle nut that tightens onto the ball joint. I got the nut started but the ball joint stud spins with it. We tried jacking up the control arm until it lifted the truck off the jack, thinking that would put enough weight on the ball joint. no luck. I've tried setting the truck down with weight on wheels and that had the opposite effect(the ball joint space opened up). Any ideas?

i really don't wanna have to replace the ball joint. right now.