[BerntR]

Running out of right arm is basically another name for a flip, right?

So this is about rhythm. If you straighten your right arm early your arms & club are out of sync with the shoulder motion already. I guess you can do that late in the down stroke and get away with it, but it is not what I prefer to do.

IMO the easiest way to avoid running out of right arm is to start with two straight arms and move the hands with the shoulders. I keep both arms as straight as possible when I chip. I've tried the alternatives, but unless a chip-putt is called for, this is what works best for me. And when I do a chip-putt, the shoulders are more rocking than turning and the stroke is even more pivot driven - with two elbows that are more or less frozen bent.

If the stroke is pivot driven through the ball you will never run out of right arm.