Was cleaning my pennys today and noticed one lens (right) is loose. It moves quite a bit. The other is solidly in place. The orbital looks to be tightened all the way. It is loose in all three dimensions including what seems to be the thickness of the lens where it should fit in the slot in the frame. Should I be concerned? Also I think these may need a tuneup. The right orbital seems to move a lot more than the left.