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6; // generally-useful spacing amount for vertical columns of stuff working_height = height - v_margin - title_font; left_rib_x = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height - 25; // build up seven rows; middle one unused row_2 = row_1 + v_margin + 12; row_2 = working_increment*1 + row_1; row_5 = working_increment*4 + row_1; //special-case the knob (in mm). If you don't need to.

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