My lesser bee has such little wobble you wouldn't be able to tell there was a defect if it weren't for the fact that she will often miss the rat on a strike. Her solution to this was... to stop striking. I'm not kidding, I don't even wiggle the rat for her any more, I just set it on her half-log and she casually saunters over and consumes. At some point she figured out the rat was already dead and not going anywhere, so why bother with all the hard work?