Again, based on my experience, the spanner nut may also be held in place with some of the pine resin.
I use a pair of needle nose pliers that fit the spanner notch slots, and a Crescent wench at the hinge point of the pliers to help turn it.
Again, a little bit of heat from the propane torch may help loosen the pine resin that maybe helping to hold the spanner nut on.
Remember, never enough heat to cause burning!
My best,
Blair