Driveloading is a prodedure where you use your right hand to actively reduce the lag between your shoulder turn and your hands. With drag loading this happens passively. You then only use your right hand to structurally support the hand path and to sustain the lag pressure at impact.
Also, driveloading is associated with a pp#3 pressure that doesn't rotate back and down again and an elbow location at the top that supports this - a right forearm at right angles to the inclined plane. I aims down the swing plane at all tinmes. Drag loading is usually accosiated with pp #3 rotation. At the top of the back swing, the pp#3 pressure and the elbow is more under the shaft - and thus, the right forearm is at right angles to a horizontal plane.
Third, driveloading is associated with angled hinging while drag loading is associated with dual horizontal hinging.
There are variations and exceptions to two and three above, but the first one is the fundamental difference between the two.
The amount of pressure you feel in your right hand at impact doesn't necessarily differentiate between driveloading and drag loading.
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