I started out by milling the hub area where the nut would normally go. I then bored the hole where the spacer used to go a little bigger. I then machined some aluminum rod down to fit in the bore. After the adhesive set up, I machined the new bearing seat and threaded it to 8-32 threads. Then I flipped the yoyo and machined hubstacks. Nothing sticks out like the Throwdown FHZ stack kits used to.