There's a guy in Brazil that makes really good looking 737 yokes, and remarkably cheaply. He's put some anotated pictures on a webpage:-
http://lacleite.fotoblog.uol.com.br/But I can't read Brazillian (which if memory serves is Portugese...)
Would one of our Portugese (or Brazillian, if there are any of you in the VA) colleagues would be kind enough to translate it, that'd be cool.