Tom, mine is built exactly the same, I took it apart earlier today.
Sackett, it sounds like your machine might be a little different. Is this the case? Do you have an Atlas 7 or an Atlas 7B? I understand that the '7' (and some early '7B') machines used a slightly different power feed assembly (cast iron housing instead of Zamak, with a few other differences).
The easiest way to tell if you have a 7 or 7B is to check if you have a table support leg under the front of the work table. The '7' machine did not have one, '7B' machines did.