For those of you that have installed night sights (I bought Mepros from TGS) a few questions for you if you would be so kind. Do they come off/go in from the right or left? Did you use locktight and did you have to file the sights at all? I'm thinking about installing my set today and just wanted to see how everyone had made out. I've installed a little over a dozen sets on Glocks and Sigs but didn't want to foo-foo my p2sk. Thanks!