BeeJayBee
Queen Bee
Actually just found some info. ...
The cells cocoons build up at the bottom (along with the poo, Finman) and the bees can 'ream out' the cells (like JBM said) to readdress the diameter after some high pressure tongue work. (made me feel quite inadequate JMB!) So it appears after they get too small the bees rebuild them like you said Finman.
Here is the Dave Cushman shortcut for others.
http://www.dave-cushman.net/bee/smalboldcomb.html
If I remember correctly, from forum chat, the comb Dave Cushman was referring to came from ITLD. It had been used by ITLD's father (?or uncle?) and was at least 22 years old, possibly older. Which is another reason why it might be a good idea for bjosephd to try to contact ITLD and find out more from him.