I got a 501 a few weeks ago and I've been really happy with it so far. It's the perfect size to just throw in my pocket and it's been there everyday since I got it. However, I just noticed the scales have gotten loose. I thought I kinda felt it a couple days ago and I was just wiggling them and no doubt they've got some play. Anyone else come across this with the 500 series? If so, how bad does it get?