I sprayed my slide this evening with Break free CLP cleaner lubricant after a range visit and when I was finishing up with the slide I found the front NS (trijicon) was very loose and can be slid right out of the dovetail. This gun is 26 years old and the sights still work, so they are under 12 years old, but this gun was refinished and you can see the green Duracoat remaining under the sight, so the previous owner removed the sight prior to spraying it. Is there a small hex screw in that hole on the top of this site? How can I get this thing tightened back down??