[Burner]

I actually thought someone would say, "do you think I'm an idiot?" when I posted that picture...but what the heck!

Then I am twice the idiot because my flashlights are joined end to end, with the lights facing away from each other.

Held like a golf club, this contraption allows me to trace the plane line on take away with the downward pointing light at address (i.e clubhead light). I can then check that I am on plane going to the top of the backswing, and that I am parallel to the target line at the top, with the light that was facing upward at address (i.e butt end of the shaft light). From there I can then trace the plane line coming down, again with the butt end light.

At parallel to the ground on the down stroke the lights face the target (butt end) and point directly in line away from the target (clubhead) - the opposite, obviously, having applied on the backstroke.

From that point on the clubhead light traces the plane through the impact area and follow through to the finish.

A very valuable training aid.