9000 miles now on the Surly

My beloved Cross Check just passed 9000 miles. Impressive. This bike has been through a lot. So, I thought I would pamper my trusted steed with a new rear derailleur. The old, stock derailleur is seeing some wear/rust, and not shifting as cleanly as it probably should. Regardless, stock Surly components have really done quite well given what I've put them through over the course of 9000 miles.