[12 piece bucket]

The pivot center is part of the control of the left shoulder motion to ultimately control the primary and thus also the secondary lever assembly. The left shoulder location itself around that stationary point is controlled by the right shoulder.

The stationary point is the ideal objective. There is little in the way of tolerance. Skilled swaying is achievable but hardly considered good form. The body will never 'twist' correctly and is usually taught by teachers (ie. Leadbetter) who lack any real kind of physique capable of playing non-compensated golf. The 'cheap' pivot motion that swaying produces progressively counteracts the ability to create thrust against the primary lever assembly in the downstroke.

Very nice.