For a straight back-straight through stroke, pretend to rock the baby.

When you see kids 'rock the baby', they move their arms only -their shoulders are still.

From a putting position, you can do the same thing. Some people call it turning the shoulders around the spine - but the key is to have flex in the arms, so that you can keep the putterhead low.

I personally putt this way. I have a slightly open stance, and stand quite upright, but I'm a straight back and straight through kind of guy. (And I have yet to read Dave's Putting book. His Short Game book was awesome! I'm re-reading it, and picking up new things).

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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.