loose arm

Hi all, I bought an Oakley Radar Ev Path on July 17, but noticed a couple days ago that the right arm/hinge is loose (ie glasses bend under its own weight). Is this normal wear-and-tear?

I've got a pair of seafoam green heritage razor blades that I picked up off ebay last week and the arms are pretty loose. I had a pair of razor blades before that weren't nearly as loose, the arms on these ones kinda flop around and tend to come off rather easily. The clamp part near the hinges...

Hello. My pitbull's arms are starting to loosen. I wonder if anyone on here have tried tightening theres and what kind of tools they've used. TIA!