Tell me, and we will both know

I bought a spanner wrench and can get it on the holes, but not enough leverage to turn it.
I’m thinking I have to remove the fender so that I can fit a cheater pipe to the wrench. My other thought is if I can torch the neck off the tank first and then deal with it in the bench vise.
No worries about the flames, tank has rust holes as big as my fist in bottom.