If they are a good friend, then they should be able to take your suggestions without feelings getting involved.
But I would get a video camera and tape them. Then both of you sit down and watch the tape so your friend can see what you are trying to tell them. Alot of people can not see what they are doing wrong while they are doing it. But when they watch a tape, they can now see what you are trying to tell them.
As the old saying goes, SEEING IS BELIEVING.
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T.J.
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