Originally Posted by
Kontact
I was a shop service manager for years. It is an exact science, and I know that because of decades of experience that I'm betting you don't have.
I'll never understand why amateur mechanics post their problems on forums and then ignore any and all advice offered.
++++ total agree, bicycle components are Engineered.
Take apart an automotive engine, say in your Mercedes Benz, and you will find things that are shimmed to fit. Parts and assemblies can economically be made to limited tolerances and often there needs to be an adjustment during assembly. These adjustments are based on MEASUREMENT, which is a SCIENCE, not a random guess.