Sometimes, when you deal with folks that consider themselves, Professional's, you have to become asscertive. My LBS is GREAT but there have been times that they've checked out a problem and couldn't find an answer, I kept on them, nicely letting them know, I wasn't happy with their judgement and they kept working and we've found the problem and it was fixed to keep me happy. IF, I got that type of attitude from a shop, I kindly let them know that I could buy my bicycle from "any of the MANY" shops in town or get my repair work done or spend my accessiores monies at any of them. That's only happen once and it's not happened again! If you live with a bicycle long enough you really get to know, when there's something, Not Quite Right with it, sometimes it takes more than a "quick" adjustment to find a problem and with the "pressure" on a line mech. (tech, whatever), to get "bikes in and out of service asap", Now you don't have to be an A$$hole but, you have to stand your ground.