Some would have your believe that a bicycle is a hugely complicated machine, and you should always take it to a bike shop. I assure you that it is not. For anyone that grew up on a farm, they are quite simple. And then there are guys like me that worked on office machines. I worked on what was a really large selectric typewriter, the IBM Composer that had 5000 parts, so for me, and bike is a super simple machine. And believe it or not, one ink jet machine had adjustments so fine, we had to mount a small microscope to make the adjustments down to one thousand of an inch.