Additionally, in the tapes from one of the master's classes, he encouraged the slide for anyone (hitting or swinging) that was trying to trace a straight line. Anyone trying to trace the visual equivalent, the arc of approach, needs to have plenty of balls in the bag. You'll need them.
What do you mean Ted? What's the difference? Are you talking about tracing a straight plane line as in the Flashlight Drill...or are you talking about the visual 'clubhead blur' as you take it back?