Does anyone have resources on how to disassemble a geared mixup cube? I handed mine to a child who shifted one of the layers by one tooth and now it won’t turn I can’t figure out how to take it apart. I’m quite desperate. Any help?
You probably don't need to disassemble it, after all, the child who messed it up didn't.
Twist the shifted layer about a quarter turn. This puts it at about 45 degrees compared to the adjacent middle layer. There should now be enough room for you to shift the gear of one of the edges of the middle layer by one tooth relative to the twisted layer. This will distort the cube and lock it up. It may be under so much tension that it won't stay that way and slip back, but try to keep that from happening. Do the same for the other three edges in the middle layer one by one, and after the last edge is skipped a gear tooth the cube should be okay again.