I've been trying to replace the gas valve on my Yugo SKS. The problem is I can't get the old one off. I've tried all the recommendations I've found, and nothing has worked. I sprayed it down for a couple days with WD40, then Hoppe's Elite, then PB Blaster. When none of those worked, I submerged it in PB Blaster and let it sit for three days, with still no effect. I got a cheapo torch and tried heating it a few times, but it still wouldn't budge. Just for the heck of it, I put it back in the PB Blaster until I figured out what to do. It sat in it for 6 weeks before I decided to take one last crack at it. Still no success. Does anyone have any other suggestions? Or am I better off just to toss the thing in the lake? Also, is it possible to get a replacement barrel for it?