Try hitting some short wedge shots (25-50 yards) with just your left hand and arm. Don't use your pivot just rotate your left arm back and through.....rotate it hard to the finish and maintain a flat left wrist.
This drill has helped me greatly with adding a finish swivel to my own stroke pattern these past few months.
Sorting Through the Instructor's Textbook.
B-rAy
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Catch ya on the lesson tee.