*Missouri Meth Joke*
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I think the perpendicular illustration was to try to clarify a question raised on irregular OB. Example would be the OB is a right angle and the disc lands off center on the corner in bounds.
If it's anything like #5 at Cliff, there will be pieces of gravel on the pad itself. But it is only a mild annoyance compared to a bunch of mud every time it rains. Anyway, it looks real nice in that video.