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On opposite sides of the rail + a safety margin // margins from edges v_margin = hole_dist_top*2 + thickness; working_height = height - 25; // build up seven rows; middle one unused row_1 = vertical_space/7; row_2 = row_1 + v_margin + 12; //knob_radius top_row = height - v_margin*2 - title_font_size; working_increment = (working_height-v_margin+thickness) / (9); // generally-useful spacing amount for vertical columns.

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