I just picked up a Jonathan Browning Mountain rifle off of the forum. Took it to the range and when I returned home to clean it and I was taking out the clean out screw on the "snail" it felt "sticky" and the threads on the screw are stripped. I found another set screw and installed it but there is nothing to stop the screw or nothing for it to tighten up against. When I was running an oil patch down the barrel you could see oil bubbling out around the "new set screw" I installed. What is the purpose of this screw? I really see no reason to remove it to clean the rifle beings I pull the nipple. Is it supposed to be a tight "plug" or "fit"? Or is this just a plug to fill that hole that was made during drilling the flash hole? This is the only rifle I have that has this.