I have a nasty case of STUCK CO... I mean LOCKRING. The cog and lockring were attached at the LBS in the place where I used to live, so I can't go back there.

* Tried the Hozan Lockring Tool. No go.
* Tried heat. Didn't work.
* Applied lots of WD40. Didn't really help.
* Tried hammer + screwdriver method.
* I tried to tighten the cog more, to free up space between cog and lockring. But the cog is so impossibly tight already that I can't turn it any further.

Are there any other options besides destroying lockring (and also lockring threads)?