I'm in the process of putting my motor back in my car and I was sorting through my parts and i found the little metal thing that looks like the other half of a ying-yang and i do not know where exactly it goes back into my distributor!

It's a Proform HEI distributor.

If you know where it goes, could you please be descriptive as to where and how i get it into the distributor? Thanks a bunch.
-Tom

P.S.:
Any picture links telling me where to put it would be GREATLY appreciated >_<