Often times, it is difficult to remove an axle from a yoyo. Some people say to use a pliers, maybe putting tape on the axle to prevent wrecking the threads. Here’s a safer method.
Try the “double nut” method. You thread on two nuts, tighten them to each other, then just put a wrench on the lower one. This is done by holding the upper nut in place while tightening the lower nut to it. With the nuts locked apply force to the lower nut in the correct direction to loosen.
This comes up enough that it deserves a topic. It has been added to the How to Do Stuff sticky.
Well what you need are slimmer line nuts. And thinner wrench’s. I have this stuff laying around. but normally the nuts are cheap and right next to the thicker ones. the wrenches are either going to be hub wrench’s for bikes or cheap ones that come with furniture.
Of course, before reading good information I tryed everything almost damaging the axle, so I strongly suggest that you do it differently from me and read the forums first!!!