Materials needed: A six inch length of 1/2" dowel.  A foot or so of duct tape.  Coarse sandpaper ( a sander of some sort is helpful; I used a belt sander).  Use the sander to taper the end of the dowel slightly, as shown in the picture.  It will fit into the hole in the center of the flywheel.  It doesn't have to be particularly pointed, it just needs a bit of taper.  Try to get the taper as symmetrical as possible.  Wrap enough turns of duct tape around the dowel to make it large enough in diameter to fit snugly into the hole in the center of the clutch disc.  Just a few turns will do the trick.  Don't worry about great precision, just work for reasonable fits and this tool will align your clutch disc perfectly.  What it does.