[stimpson]

Thanks! Now I get it. One final thing: I never really understood how he positions the leaning "plane angle stick" behind him.

How does he make sure that he does not catch it on the downswing? He'd make a mess if he did. Maybe he has good-enough margin between the shaft and the plane - or its long enough that his plane-shift will end up well down the shaft - ensuring that he can not catch it.