Here is the newest addition
and where the cams go
DH got excited about while looking it over - it has the same mechanism as the Singer 237. The shuttle hook assembly moves left/right along with the needle
Left needle position
and right.
This is one heavy machine! I'm going to look for a White cabinet to put her in. I "sort of" have an idea what the one my Mom had was like. I'm also very close to sure that the machine from the attic was the original occupant of the cabinet that I remember.