re: Any drills work to eliminate a bad over the top swing?

quote:

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“to start your downswing, let your weight shift to your left foot

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This all you need to know. Over the top is from early rotation of the shoulders at the start of the downswing while your weight is on the back side.
Reverse that sequence and you're in business. The weight shift will cause the club to drop into a flatter plane; trying to direct the arms on the downswing will work for a swing or two or a hole or too, but it doesn't address the root cause.