If you don't have anything useful to say, keep your comments to yourself. I'm asking these questions, because I'm trying to become a person more familiar with bicycle repair. Obviously, I can take it to a shop, and have it fixed, and if all else fails, that's what I'll do. I have a specific problem, and I'm trying to understand it. It's not like I'm unaware there are establishments called bike shops that fix bikes. A lot of people have been helpful so far, and I've made progress, but if I listened to people like you, I would never learn anything, because I would outsource any challenging task that came my way.