OK, here's my best attempt at explaining it. Here's the picture:
Reassembly requires parts to go back in this order:
1, 2, 3, 4, 5, 6 all go together in order listed.
7, 8, 9, 10, 9, 11, 12 all go back together in order listed.
BUT you have to have part 10 slid over part 1 when you assemble them such that part 7, 8, 9, 10, 1, 10, 9, 11, 12 all go together in that order.
When you do this, you need to make sure that part 1 is on the left and the pointing part of the base of part 10 is on the right.
So try this: Assemble in this order 7, 8, 9, 10, 9, 11 WHILE 10 is slid over 1. Don't put on the part 12 that locks it in place -- this is just to give you an idea of how it works. So the spring is what you are having problems with. The coil parts of the spring will have the two metal bushings seated in them. The flat part of the spring in the middle will be pressing against the left side of the shaft of part 1. The two remaining L shaped ends of spring 9 will individually press against each of the two point ends at the bottom of part 10. The result should be that the spring will cause the lever 10 to always want to spring to the left. Did that work? If so then take it apart and put it together again but this time you need to have it inside of part 3, which means you have to do a bunch of this assembly inside a little space. Perhaps someone else can describe this better. Good luck!!!!!
