We have bar-end shifters as well. We had the left (front) one fail. I don't think they are repairable. Ours is a 3x8 speed. I found some 3x9 Durace and just installed the left one. I decided that if & when the right side fails, I'll replace the cassette with a 9 speed. I think I paid about $110 for the pair. Maybe from Pricepoint.com (?). You might also find some on eBay. Maybe just the right side.