Wring a towel to keep the club face square
This is a feel for keeping the club face square and stable through the swing. Hold a club out in front of you and imagine wringing out a towel - your hands work in opposition to each other, and when they do the face stays completely square. Wring all the way to the top and back into impact and nothing happens to the face. Simon's fault was the opposite: both hands working too much in the same direction on the way back and through, which leads to very inconsistent ball striking and accuracy.
Channel: Danny Maude
Watch official source at 9:02Why this context matters
Instructor credits the drill to Pete Cowan and used it with a student, Simon.