Stuck coilover, remedy suggestions needed

[vex]

Alright, my left rear coilover is stuck when it comes to ride height adjustment (they're tien flex if it has any bearing--still under a year old). I've tried just about everything I can think of. Silicon spray lube, leverage... but when it comes down to it, i can't get the threaded cylinder to actually move in or out of the bottom to adjust the height.

I don't have any PB blaster here so I haven't tried that yet. Any one have any thoughts on how I can get the threaded cylinder to free up and move? All the other coilovers are 100% fine.