[EdZ]

The lag pressure required by the small pulley Swinger is less because the butt of the club travels a shorter distance through the pulley section. Less LW speed is required to keep the hands ahead at Impact. Most of the head speed is due to a snap release of max wristcock. With large pulley Swingers, more LW speed is required to keep the shaft from leaving PP #3 behind because the butt of the club moves a greater distance through the pulley section and there is less wristcock so the head doesn't have as far to go to catch the hands. They rely on a big arc, rotation, and arm speed for head speed.

Makes sense, well described MJ.

Given that, would the amount of mass, the amount of 'support', at impact either be 'less' for a small pulley swing, or at the least, less predictable?

In other words, distance control AND leverage would be more efficient with a so called 'large' pulley swing (read: proper extensor action). The small pulley swing would offer SPEED benefits, however there is reason to question the consistency of the available MASS in such a swing. I'd venture to say this is a key reason Clampet and/or O'Grady had/have rumors of distance control issues (correct me if I am wrong on that one please).