Haha yeah, if you’re not careful you could ruin the axle. I tested one out, made sure to thread it in 4-5 times, and didn’t have any issues with it. Someone may buy one without reading and just throw it in there and crank it too hard, but not much we can do to prevent that kind of thing really.
It does make a noticeable difference in play though, which is probably what surprised me the most. .5g isn’t a lot of weight, but you can feel it on a yo-yo that you know well.