To make a perfect coil, the wire wraps must be wrapped very close together. Thinner gauge wire can be pushed together after coiling, but this is much harder with thicker gauge wire.
Two or three wires can be twisted together for a unique effect.
There are a few different methods and tools that can be used for coiling wire. You can purchase a coiling tool such as the Coiling Gizmo, which is a wonderful tool that will create multiple sizes of coils, if you plan on making lots of coils. However, if you do not plan to make many coils, you can coil wire on a mandrel such as knitting needles or dowels or use a 3-Step pliers.
Because wooden dowels have a grain and are soft, in can be difficult to remove your coil. This can be especially true if you have coiled very tightly into the soft wood.
You can make coils on any size or shape item. This tutorial shows round coils but you can make any shape. Here you see, top to bottom, size 000, 00, 0 and 1 knitting needles as well as a bamboo skewer. Try wrapping wire on a flat object such as a zip tie or a popsicle stick. You will be amazed with the end result!