On the oil machines they have a buffer brush which puts the oil on the lanes. With the pattern the, buff distance is total length of the pattern. The other number being 35 in this instance is the last distance that oil is applied to the brush. So the buff out length is just using whatever oil is still left on the brush. As with most THS patterns there is a lot more oil in the middle portion of the lane so the ball will turn a lot more from the outside of the lane compared to the middle portion.
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