I'll put the pic up this weekend. Consult this link for diagram
I think the main jet is there close to #3 by the float valve and the piece that came off is the smallest of the three, underneath the tiny black ring on the bottom.
So does this mean that the entire jet comes out? It's very corroded and I'm afraid to break something else.
I don't see how this piece can be re attached? it's not threaded...