Get the sping started on the post with the spring on the shoe, and use a vise, or have someone hold the engine while you use a small flathead vety carefully to compress the spring and slide the shoe/spring assemaly all the way on the post with the non=shoe side in that grove on the nut that hold the flywheel on.
[Edit] There should be a diagram in the manual for your car/truck/buggy if you have one. I don't have a digi cam, or scanner, so I can't past a pic of my diagram for you, but may someone else can if you can't figure it out.