This is a very basic diagram. It forgets to mention things critical to making a spinner like: using a bearing, hydronamics of the body, weighting, blade size and thickness, using a split ring for the hook attachment, etc. If you want to get serious about making spinners, I'd start by reading the book (Spinner Fishing for Steelhead, Salmon and Trout by Jed Davis).
As I've said before in previous posts, making spinners is a great hobby and when you get good at it, you'll outfish any store bought spinner 5-1. I supply all my friends with spinners and get many orders year after year.