Have you ever thought "I need a ring this type, this size, and I can't find it"? Well, there's a really simple way you can do it your self.
- something quiet hard and cylindrical of the diameter of the rings you need. A screwdriver we'll be perfect.
Coil the wire around the cylinder. Try to make the spiral as tight as possible. Do as many turns as the number of the rings you need plus two. This is because the first and the last will probabily be wrong.
Pull out the spiral from the cilinder.
Cut the spiral on the same line.
Step 5: Rings!
Here you are: you have perfectly circular rings.
I've made this 'ible with a really thin wire, but you can do to with any kind of wire as long as you can bend it.