Been getting some more questions on 'tracing the plane line with the right forearm.' Mainly how can you trace the plane line when the clubhead moves on an arc. Here's TGM Authorized Instructor Martin Hall explaining how it works with the 'Smart Stick'
You can use a laser point and stick into the grip of an old club or tape it up on the grip or put in on a wooden dowel. The Smart Stick can be found at www.smartstickgolf.com