Sorry for the newb question, but I am trying to remove the left axle nut on my Spyder so that I can use a side-mounted license plate relocation bracket.

I've got a 36mm socket and a large wrench, but when I try and remove the left axle nut, the right one (the cotter-pinned side) ultimately turns and comes off. I can't seem to turn either side to get the left off without the axle spinning and the right nut coming off.

Is there a trick to this, or does the left always stay on and you have to push the axle out from the right to get to that side?

Thanks!