I'm about to change the coil springs on my 997.1 carrera 2 with pasm for some H&R springs but I'm struggling to find a 21mm open sided socket for the front top nuts. I believe its easier to loosen the nut with an impact wrench whilst still on the car or would it be best to persevere with "WURTH rost off"and a plug socket or just get the strut off the car and then deal with it, all suggestions are welcome