Sounds like there's a piece missing then. I'll have to get a better picture so we can tell for sure.
Greg, here's what the assembly looks like on Adelle's listing on eBay:
http://tinyurl.com/26hug9qYour barber has the finger wheel and the large screw. All he needs is the escutcheon (the thing at the bottom of the photo) and a dial card retainer ring assembly. Adelle often has those listed, usually a pair. I have purchased complete dial card retainer rings from her, complete with an original card for about $10 plus shipping.
I'll look to see if I have an escutcheon. I remember buying a couple (I only needed one). Now where did I put it?