I agree with Gord and will throw in 2 cents.

When one has a back problem finishing the swing can be a problem getting streched to the finish and leaving the through swing short. A practice drill is from address go to a finish position, then work back to the top. Then go back to a finish. The first move will engrain the finish position, Going backward to the top will give the swing the path, then the through swing will strech the muscles on the same path. Do this for 15 minutes a day and your swing will come back quickly.

GB

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The guy in the white hat!