Originally Posted by knothead
I'm also not suggesting that you don't take advantage of scotty's generous offer but here's a link to a company that makes sheaves.
Zephyrwerks - The Sheave Factory
I used Zephyrwerks for a large halyard sheave that I couldn't find anywhere else (5,25" dia., .500" wide). Ed made an absolutely gorgeous sheave out of black Delrin with bronze bushing. It cost $95.