URGENT : In the middle of drag strut install...

ARGH!!

I'm in the middle of installing my lakewood 90/10s and i'm having problems. We pulled the strut out along with the strut mount, but we cannot get the strut out of the mount. When we try to losen the nut on top of the mount, the rod in the strut turns and we CAN NOT stop it. How do we keep the strut from moving while losening the nut? We've tried vice grips, we've tried holding it, we've re-installed it, we dont know WHAT to do. Please help, this is frustrating and i'm on limited time. THANKS!!!
-GM