We bought the Final Arc 2 for my son, and it has been very helpful. He had a decent swing already using rotational mechanics, but your video clarified a few things, particularly the 105 lead shoulder. He had a good lead arm, back elbow slot, tilted axis, good L's for back leg and bottom arm and flat palms at contact... but has been coming up short of the fence - lot's of doubles in the power alleys. I think the 105 lead shoulder may get him over the fence with some extra BHT, and he is working on this. That said, I'm convinced that THT will be the final missing piece that could also help with his power numbers. However, I'm still not sure how to best drill THT. In the video, you describe THT, and demo it with a golf club and a bat, but then say that THT is beyond the scope of the video instruction.
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