I hear more and more of people taking their yoyos apart and losing bearings, C-clips, shields and axles.
I find the best way to avoid problems is to work in a more controlled manner that helps you keep your parts located in case something should accidentally fall. This doesn’t always work to good for C-clips though, but it works fine for the rest.
First, if you have a frisbee or a box lid with a lip, or even a tray with a lip all around it, do your dismantling in there. This way, all the parts shouldn’t really have anywhere to go
Another option I use with laptops is a piece of paper and tape. I will mark a spot on the paper that corresponds with the case and then put the screw in that little circle and then tape it in place. Now, the problem with my plan here when adapted to yoyo is you really don’t want tape residue on your bearing, shields and C-clips. It’s best to have a small container to put those parts in.
There’s many reasons why you take your yoyo apart and then not put it back together right away. I always recommend if you do need to walk away, you have some sort of container for your parts to go into so they don’t accidentally get lost.
In this case, what has happened has happened. It’s best to simply take the yoyo into a hardware store and CAFEFULLY try various screws using the tester that the store provides, IF the yoyo can fit on it. Otherwise, you need to try a few longer set screws to find the proper threading. After that, you need to find the proper length.
In this situation I would suggest contacting YYF or YYE for information regarding specs for the axle. After that, you have two choices: Buy the appropriate axle from YYE or YYF(unless YYF will just mail you one, their call!) or go to a hardware store to pick up a spare axle. They usually are sold a couple or more in a little baggie.