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Circumference of the rail + a safety margin // margins from edges h_margin = hole_dist_side*4; v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2 + thickness; working_height = height - v_margin; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns of stuff.

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