Christy, maybe this link will help. I have the service manual but the pics are dark and not real helpful and it does have an exploded view of the bight assembly, also tells exactly how to retime the machine and a lot more great info.
I didn't know these were rare because I see them everywhere up here. I bought them hoping to make one really nice collection model because I liked seeing the design cam on the outside..LOL The original electrical is always a disaster on the ones I see.
I will still get some more more pics for you after church today....
http://www.manualguru.com/singer/306w/users-manual