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Here's a link to an exceptional collection of information on anything related to the Zenith carburetor. I wish I had found it before trying to learn a lot of it the hard way.
Look around the website. There are numerous categories to help, with clickable links within them that share good tips.
Armed with this and Tom Endy's excellent article you should be able to handle most issues with the carb.
http://www.model-a.org/default.html