Originally Posted by
JohnDThompson
The head tube fittings and fork crown race seat need to be precisely concentric in order for the headset to adjust properly without binding or slop throughout the whole range of rotation.
I'm glad you posted this. Now(!) I understand why a bike mechanic told me I, or rather he, had to reface my old Peugeot's head tube to fix my headset binding problem. He, of course, explained why, but it wasn't sinking in.