I have a McCarty and wanted to ask Qs about the adjustable bridge. I noticed that the saddle adjustment screw for the low E string was sticking out more than the other 5 adjustment screws. I loosened the E string, screwed down the adjustment screw, and tightened the E string again. Only to notice that it again was sticking out further than the others. In other words, the threads did not seem to be engaging. I then removed the bridge and removed the adjustment screw completely, then reinstalled it. Once reinstalled, I was able to move the saddle in and out properly with the adjustment screw. While the screw was out, I noticed that there is some sort of thin "retainer" that appears to be what the screw threads engage, as opposed to the bridge itself being threaded. Is that the case? My concern is that I noticed that even when reinstalled, the brass saddle for the low E has some play, while the other 5 seem much more solid. Should the saddles be "tight/solid"? Any thoughts on this?