I've just been trying to adjust the trigger pull on a recently acquired second gand Sako 75.
However, on lifting the action out of the stock, I discovered that the thread of the adjustment screw has been coated with a glob of a hard red resin of some sort. It looks a bit like candle wax, though is hard. It prevents any movement of the screw.
Does anyone have any idea what this might be and have an suggestions for how to remove it?