Is 'The centering operation is important because the diameter of a knit tube varies slightly along its length, and it is necessary to reference cutting from the midline of the tube.' a fitting logical lead-up to 'The centering operation is pointless.'
The centering operation is important because the diameter of a knit tube varies slightly along its length, and it is necessary to reference cutting from the midline of the tube.###The centering operation is pointless.