I have an old Trek 520 which I am overhauling. I have Shimano downtube shifters, with index rear but I can change the setting to friction if needed. I am thinking about converting to Shimano brake shifters but I would lose the ability to switch to friction. The newer 520's come stock with bar end shifters, but I really like the brifters. I've been looking thru past forum posts and it looks like bar end shifters are the norm. Any one using brifters on their touring bike ? What do you do if problems with the shifters ?