The Nissan Path

I am changing my front struts. Being relatively new to this I started to disassemble the front suspension. I backed the nut most of the way off the upper control arm spindle bolt and tapped with a hammer to break the seal between the control arm and upper suspension arm. I left the nut on a few threads not knowing how far the whole suspension would drop. Well, now the spindle spins freely and I can neither back the nut off the remaining threads or tighten it back up.

Does anyone have any thoughts on how I move forward?