I have a question for those in the know. I have an LC9S that I would like to change the sites on. I have tried, unsuccessfully I might add, to push out the old sites. I purchased a pusher to remove the existing sites without damaging the firearm. Did Ruger glue the old ones in with some compound? The set screw does have thread locker on it, but not excess and came out easily. Will the rail need to be heated and to what temperature if so?