Originally Posted by ryan_c
Take a page from Tomity's book and polish the other side yourself. It'll still be the same cog, but at least you'll have one less thing to complain about.
I have one of Tomity's cogs. He has the beveled edges rounded, the teeth polished, and then the entire thing plated in nickel. The goal is to reduce friction. He has cogs in each state to explain the process. Whether or not friction is appreciably reduced is another matter, but frankly I don't care, as the quality of the finished product is excellent.