I’ll use that sometime! Have you tried Z-stack mod, to make them fit well, that would be interesting. edit** Also modifying a FH(Z)(2)(ect) for side effects would be nice but possibly to much weight.?.?.?
There are many, It’s called google or search the forums here. I could explain the basics.
Get a FHZ pop out the caps and take out the bearing and other stuff so it’s just the halves, then if you want a cool splashy splash use the axle and put the end of the axle on a drill(dremel is better if you have one) put paint of your choice inside the yoyo halve and turn on the dremel/drill the paint should rise to the edges then stop. I’m no pro I’ll bet Cyclontzy or yoyospirit could explain beter.