suspension issiues techy guys help

[batman]

right tryed to undo the rear coilover tonight for some lowering and the pinch bolt in the bottom ring of the coil over snapped so i need to drop the whole rear unit  to gain access to removing the snapped stud but i need help with this... whats the secret to getting this yellow arrow nut undon without the white circled part turning ?
 
 
help:2eek
 

[Jit]

you should be able to slide a 17mm open ended spanner on the circled bit and then wedge it against the suspension arm to stop it from turning

[batman]

not its like a ball joint with a nut on the end

[Jit]

yes and theres 2 flat edges on which you can get a 17mm open ended spanner (not ring spanner)

[batman]

ahhhhhhhhhhhhhhhh
 i see thanks jit buy my wings >

[batman]

next question then how do i get the snapped stud out lol