Rebuild Your Pullstarter, page 3
There are two ways to wind the spring back into place. We will show you both, they take roughly the same effort.
The first method starts by hooking the sharply bent end of the spring into the corresponding slot in the spring assembly.
Then you just wind the spring counter-clockwise, until the spring is completely wound up into the spring assembly. The trick with this method is to keep the spring in place with your thumb, so it doesn't spring back out.
The second winding method uses your hands instead of the spring assembly, it's a little quicker but takes more pressure from your fingers to keep it in place. Remember that the spring needs to be wound counter-clockwise, as shown.
Keep winding until the spring is completely wound upon itself.
Pull it tight and wind it again until it will fit inside the spring assembly.
Then hook the bent end into place and carefully set the wound-up spring into place.
When you are finished, the spring assembly will have the spring full in place. Keep pressure on the spring so it doesn't pop out!