The Colorado Spinner is one of the simplest and one of the oldest spinners in existence. Developed sometime in the 1890s, the Colorado Spinner has been catching fish for over 120 years.
It consists of a swivel, a Colorado blade, another swivel and a hook. Those four key (and necessary) elements are held together with split rings. There is no wire shaft.
I have seen them made with a treble hook, a single hook and a pair of single hooks.
I make them with a single barbless hook. The split ring and swivel assembly makes it harder for a fish to throw the hook, so more hooked fish get into the net.
There is no added weight, so they are easiest to cast with an extra ultralight, super ultralight or extra, extra ultralight rod - or any rod designed for fishing in the "Areas" in Japan. "Areas" are private, pay-to-fish lakes that are heavily stocked and heavily pressured. Anglers use very small lures, very light lines, and very sensitive rods. You could use an ultralight rod and 2 lb line, and cast the size 1 and size 0 Colorado Spinners far enough to catch fish on small streams. The size 00 Colorado Spinners will be a bit of a challenge to cast even with an XXUL spinning rod. However, they are light enough to cast with a fly rod.
The following sizes are available here on Finesse-Fishing.com. I doubt you will find sizes 0 or 00 anywhere else.
Size 1 Length 1 7/8" Weight 1.25 grams
Size 0 Length 1 7/8" Weight .95-1.00 gram
Size 00 Length 1 1/2" Weight .65 gram