Lets stay simple here. Most lasers are in the grip (Harmon’s has a grip and a shaft laser light- I never used one- bad idea since the clubhead doesn't travel that path- this is a hand path). The grip end laser only works after take-away when the clubhead goes up and the grip end faces the plane line and as the grip is pulled down on the down stroke. (The plane line-just in case- is the straight line on the ground that attaches to the incline plane like a gutter to a roof). If you use a hand held flashlight (or small laser beam), you can now point to the plane light at address, trace it on the take-away and re-trace it on the down stroke. And this is the same arm movement you feel during the stroke.
When it is held in the hand- it is pp#3 you are pointing and the right forearm you feel moving on plane. Get a small mag lite and drive you loved ones crazy.
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