This is an experimental design for a yo-yo disk that can be assembled with a commercially available yo-yo kit. You will need two of these disks along with the kit to make your yo-yo. As of yet I have not tried making a yo-yo of my very own so good luck!
The disk is hollow to reduce cost and would need to be filled with some type of hardening resin or glue to fill the empty space. The disk is modelled after an old Duncan professional style yo-yo from the 1970's.
https://artsandculture.google.com/asset/yo-yo-duncan-diamond-professional-yo-yo/awGenngPuPQi_w
The commercial yo-yo parts kit may obtained from this
source:
https://www.woodturnerscatalog.com/p/63/4090/Artisan-Classic-Yo-Yo-Kit