Icon adjustment nut seized. Please help

Hey guys. I know this has been covered elsewhere, but was wondering if anyone has a secret tip. My icon adjustment nut is totally seized up from our salty winters. I've blasted it with PB several times and hammered on it with a rubber mallet (mostly out of anger) and its still stuck. The only thing I've been able to accomplish is deforming the spanner wrench holes. So what do you all got for me? Thanks!

And yes, the little Allen key lock nut is loosened

 

take the allen screw out and spray the PB blaster in that hole. That will help get it in the threads to loosen it. You did jack it up to relieve spring tension, I hope.