Hi I have a Springfield Ultra Compact .45. With some novak lowprofile combat sites on it. Twice already I have shot about 100-150 rounds and the rear site nearly falls off. I try to get it astight as I can but it still comes loose. What can I use to secure it? I was thinking some lock tight but they have a few different kinds and I was not sure which to get. I accually switched back to carrying my USP instead. I could be pretty lame to need to shoot some BG and have the rear site fall off the gun. Yesterday I kept shooting with out the site for a spell but it sure is a lot more fun with it on there.