Hey folks, just bought my first 1911 last week. It's a Taurus PT1911. I know Taurus gets a lot of negativity, but it was a ridiculous price I couldn't pass up. Anyhow, a few days I was fondling it and noticed the rear sight was loose, it would drift nearly all the way through the dovetail on either side. I tried and tried to tighten it but to no avail. Took it to my LGS and had their smith take a look at it, he tightened it up with no problem. I was trying to use a 5/64" allen and needed a 1/16" apparently...ANYHOW, fast forward to today, I just got home from the range and shooting it for the first time. All my shots were low and right, I'm typically a low left kinda guy. Loosened the sight, drifted it and tightened it back up and was on track aside from being about 2" low with everything. I never payed attention to the sight again, but now that I'm home I puilled it ou of the case to clean it and the sight is as loose as can be again, and now I can't tighten it, tighten the screw as much as it will go and I can still move the site with my fingers....any thoughts? I suppose I could use locktite, but I dont really want to lock them in they aren't aligned right.