Thanks for all the replies. I'm looking over the instructions for the bar end shifter (Shimano Dura Ace SL-BS77.) It's specifically for 9 sprockets. The instructions specifically state, "This shifting lever cannot be used with any rear derailleur other than Dura-Ace." What!!?? I don't understand that. I have a more modern Sora derailleur. If the lever pulls the cable, would it not properly activate the derailleur? Is there something I'm missing or is the instruction inaccurate? From delbikers1's reply, it would seem that one can use many different derailleurs with this shifter. Maybe I have to send it back?