Help! I can't get a screw to loosen in a shotgun that needs some work. The screw in the trigger tang of my Weatherby Athena won't come loose. I have tried penetrating oil and heating by a solder gun to no effect. The tang is silver nitrate plated and I don't want to damage or discolor that. It may have been overtightened by the manufacturer, or possibly some form of "locktite" was applied. I don't want to break off the screw head by applying too much force. Sending it in for repair to SKB would take 6-8 months. Not a good option. The fix should be a matter of cleaning and deburring. Any suggestions would be appreciated.