From Tommy Armour, the Silver Scot: start the downswing by driving/turning your right knee towards your left knee -- and keep on until they actually touch.
I find it does indeed trigger all manner of right shifts and correct positions, all by itself. And for someone who took up the game very late and who gets too caught up in trying to understand the theories and how the components combine to make a single, smooth, unified swing, it's proven to be a great tip. So many good things follow, seemingly all by themselves.