If you watch Tiger he practices with his right hand only keeping the elbow connected to his side. This helps Tiger release the putter, Tiger actually closes the putter face after impact "BECAUSE" he aims right of his intended target a little. Most of don't and we release the club with the putter face staying square to our line. The right elbow does a coulple of things; it controls the speed, and face angle. Lot of times you see guys with their hands away from the body and they have to control the putter with the right forearm. When you minipulate the forearm you have a tendency to rotate instead of rock the shoulders, Decell on short putts, and cut with the face. The right elbow helps control all of these things.
Thanks,
BurleyGolf-
So should we strive to keep our elbow against our side? How does it move as the shoulders rock, or in the case of the push basic or piston stroke how does it stay there as the elbow folds?
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If the right wrist flattens at or around impact, you will suffer from trajectile disfunction.