Thanks again guys. It doesn't look like I'll be needing one after all. I had bought a nexus 4 speed hub/shifter drivetrain off ebay and when I recieved it, the aforementioned bolt was missing. I had emailed prior to bidding to see if it was a complete system and was told yes. When I originally asked them to supply the bolt, I was told to source it myself. Since I was told it was complete, I planned on a long and frustrating battle through ebay, but they (the seller) came through and said they would be sending me the bolt free of charge. When I get the bike done I'll post pics.