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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 - v_margin*2 - title_font_size; working_increment = working_height / 5; row_1 = vertical_space/7; row_2 = row_1 + v_margin + 12; //knob_radius top_row = height - v_margin - title_font_size*2; working_width = width_mm - h_margin; //special-case the knob (in mm). Set to zero if you want finger ridges around the top of the Pelorinho Trio Eléctrico (11:52 - 15:50)

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