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Zero. // Diameter of base of the rail + a safety margin // margins from edges h_margin = thickness*2; v_margin = hole_dist_top*2; v_margin = hole_dist_top*2 + thickness; v_margin = hole_dist_top*2 + thickness; right_rib_x = width_mm - thickness*2; left_rib_x = hole_dist_side + thickness; working_height = height - 25; // build up seven rows; middle one unused row_2 = row_1 + v_margin + 12; row_2 = row_1 + v_margin + 12; row_2 = row_1 + v_margin + 12; row_2 = row_1 + vertical_space/7; row_6 = row_5 + vertical_space/7; row_3 = working_increment*2 + out_row_1; out_row_3 = working_increment*2 + row_1; row_3 = working_increment*2 + row_1; row_5 = row_4 + vertical_space/7; row_4 = row_3 + vertical_space/7; row_5 = row_4 + vertical_space/7; row_3.

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