Thread: Removing a stuck buttstock

I've got an MLE butt which has a seized bolt (the big one which screws into the back of the socket). The barrel is written off so I've been putting the barrel in the vise to get a good grip but I've already shattered a couple of tools trying to turn the bolt. Currently have it upright and dripping a few drops of CRC penetr8 onto the end of the bolt periodically to try to loosen it. Any advice? I don't want to apply too much heat as I'm scared of burning the buttstock.