Wolfman said:
I see this reference alot - tracing a straight plane line.
A search doesn't show up any specifics that show exactly what this is.
Has there been a specific thread on this topic or has there been video of it?
No video demo that I have seen on this website but it is simple enough in theory.
The easy thing to do is get a laser trainer ( laser in butt of grip and shaft) and then swing - checking that at all points in time one of the lasers is pointing along the straight plane line. Obviously, when the club is parallel to ground the lights don't point at line - they should point parallel to plane line.
You can improvise with a standard rubber grip and place small powerful torch in butt and shaft end. Some prefer this because the beam is bigger and easier to see.
Technically you may not be tracing the Sweetspot plane line and some like the idea of tracing with lens of torch in pressure point 3 location BUT this basic set up will get most people tracing something like a straight plane line.