The thumb safeties seem to be kind of all over the place sometimes. Ive had them both almost floppy loose on one extreme, and almost needing two hands to get them off on the other. More often than not, it was because the detent on the safety was either too deep, or not deep enough. Pretty easily solved either way, with either a rattail jewelers file to relieve the track the plunger follows a bit, or a Dremel with a ball on it to make the detent a tad deeper. Not sure how common it is, but over the years, Ive owned around 40 1911's, and only ever had one with a loose plunger tube. And even then, it was just a little loose, and didnt affect the safety or slide stop.