Lower control arm ball joint - what size are the threads?

[1/2fastback]

I managed to to screw up the first thread and can't get the castle nut on. I need to pick up a die to fix it, but I don't know what size/thread count it is? Can anyone help? Thank you!

 

[grainboy]

Ball joint thread

I believe they are 9/16ths fine thread, same as the strut rod ends. Might be easier to replace the ball joint.

 

[Grabber70Mach]

I would try a thin file to clean up the thread that you boogered up.