[john walker's workshop]

heat and an air hammer and chisel bit. the bit bites into the side of the nut just before one of the points and starts it turning. finish with a 36mm wrench. if the nut is bonded to the aluminum threads, and takes them with it, there's not much you can do about it, other than wish you had split the nut with a cut-off disc and saved the t/stat. most of them come off ok this way, but you need air and the tool. i have a 36mm snap-on round style crow foot tool that's helpfiul on the inside nut where there's no room for a wrench.