Practicing with the training aid, slow swinging, and then precisely aligning the small hole on the pin is preparation for Ben Hogan’s slow motion drill. It forces a golfer to increase his precision throughout the swing arc and especially at impact point to the extreme. When slowly guiding the hole on the imaginary wire, and then striving to align the small hole on the pin without hitting the borders of the hole, with full attention—as if fighting for life—one can feel pins and needles throughout the body, arms, hands, fingers. That is wanted.
This feeling of precision must then be transferred to the swing. If a golfer jumps directly to swinging with speed, that feeling will be an impossibility. The solution to this problem, in transition, is Ben Hogan’s slow motion drill. The golfer practices a slow backswing, downswing, and now he has extra time to call up the sensations he programmed on the device. He has the time to call up the feeling of extreme precision, ever so slightly hitting the ball on the sweet spot and continuing with the follow through. For more detailed description you can check eBook preview, chapter “Introduction to the training method.”
Ernest Dras; author of the book "Slow Practice Will Get You There Faster: Link between Ben Hogans' mirror practice and his slow motion drill."