Mathematically, isn't the best protocol to have the rake touching the least amount of ground as possible?
GIVEN: The rake is the same basic size and will not change.
GIVEN: The ball will strike the rake in the same frequency, whether the rake is in the air (upright, or partially so) or on the ground (lying down, in or out of the bunker).
OR: Is the rake, when parallel to the ground, more prone to interfere?
GIVEN: The most "damage" to the flow of play is a rake lying on the ground as this causes the ball to often stop rolling or be deflected.
VARIABLE: The rake is perpendicular to the customary line of play, or parallel to it.
THEREFORE: A rake resting on its tinges with the shaft resting on the lip of a bunker, is mostly NOT touching the ground as it is supported by only two main points, and therefore will not interfere with a ball rolling on the ground as much as a rake lying flat, whether in the bunker or out.
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Where am I wrong?