Originally Posted by Catfisher
There are videos on Youtube showing how to install a new spring, that should show you what you need. The flat springs wind very tight into a small circle, very hard to keep flat and concise under the extreme tension. You can make a winding board out of a piece of scrap wood with short nails placed appropriately to help you while you wind the coil and hold it flat. Each spring is different so you just have to experiment with what nails are needed to assist you.
If you are going to try to rewind the spring I would highly recommend wearing safety goggles and heavy leather gloves like Wells-LaMont Buck Skins. I used to assemble spring wound gyroscopes and every now and then a spring would slip on a technician and go flying. Pays to be careful. That's the magic part!