Thanks for the link. It's the same video that I used to help rebuild my carb, but it doesn't cover removal of the internals of the center bar. If I knew how it was supposed to go together, I would dive in, but I don't want to break anything since it may be irreplaceable.

On the other hand, if I can't find out how this thing goes together, I'll have to dive in and tear the carb apart anyway, since I'll have to buy a replacement carb if I can't get this working. Hopefully someone has some experience with this.