This is just my own observation.

I battle an over the top move - especially when I get tired and start slapping at the the ball (rather than turning through it). The cause? Letting my right arm work back behind me. On the downswing, it has no choice but to come out again - putting me across the line.

I started watching some pro video, watching for their elbows. For most pros, the elbows always seem to stay in front of the body - never working behind (a couple show the trailing elbow coming back beside the body). So I started working on this - swinging with my elbows in front. The only way to do this successfully is to let that trailing arm fold up and hang. If you try to 'wing' it, your hands either go very high, or your swing becomes very short if you keep your elbows in front of your body.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.