here is a web site for rebuilding and adjusting a Tillotson X https://sites.google.com/site/mrtexascitrus/home/tilly-carburetors I have two of them that run better then my Zenith.
Sorry MrTexas I didn't see the link in your post. Great job on explaining the tillys.
...another question: I have two different needles and needle housings and I am not sure which is the right for my Tilloston, please take a look at the picture; it is measured in cm...