I have a K-80 Trap Special, on the right side of the stock's comb there are two countersunk 2mm allen screws that tighten to hold the comb in place. I tighten them but not overly so however I can't get the front one to loosen. I've tried turning the allen wrench so hard that it twisted the shaft of the allen wrench. I've tried penetrating oil (WD-40 and another one I can't remember). I've tried tightening the screw before I try to untighten the screw. I've tried chilling the post with a spray can of compressed air turned upside down in an effort to contract it as much as possible. I've tried tapping the top of the allen wrench while I hold pressure on it. Nothing has worked so far. Any suggestions would be appreciated.