Strut top bolt removal?

[markh450]

I need to change the springs on the front. Tried loosening the top nut (inside the engine bay) and it just spins the shaft. I think I need a deep shaped 19mm spanner to grip the nut while I turn the 8mm bolt head that pokes through the nut?  Can I get one of these anywhere? or am I missing something simple? can I just grip the strut from below and turn the nut?  

[PeteG40]

yr right - a 19mm swan neck aka offset ring spanner

[hayesey]

like this:

[markh450]

thanks again!

[DKnight]

air gun it at a garage, and then loosely fit it and drive home (as long as not too far lol)

[cheddarcheese]

Use a pair of mole grips on the strut piston from in the arch but use some thing so you don't scratch the piston works for me