This may have been covered before - but here goes. After shooting my model 60 3" full lug for the first time, I notice the whole sight assembly was almost ready to fall off. I tightened the front screw as snug as I dared. It was very loose. Assuming this came from the factory a little bit loose, should just a proper tightening keep it in place, or should I put a small amount of a removable Loctite thread locker on it then tighten? I would imagine with the right amount of tightening, it should hold without Loctite. Also is the rear most screw just for elevation, and not part of the assembly to hold the sight on? I don't have the owner's manual for this gun. Thanks. wyatte