sorting unit of a steel ball of dia 15.875 with tolerance of 0.07mm

Am Designing a ball sort unit, and am finding difficult in sorting smaller one.
Dia of steel ball is 15.875 with tolerance of 0.07mm.
I have to sort bigger and smaller balls both.
I have been attached a cad file with the concept.
Please help me to sort both the type of balls.

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Use two steel rods placed to form a "V" shape to sort the balls. Balls starting from the narrow side of the "V" will fall down where the distance between the rods equals the diameter. Simple and adjustable.

 
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