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((360 / sphere_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, r2 = knob_radius_top, h = knob_height, $fn = 3, center = false); z_position = height - v_margin*2 - title_font_size*1.5.

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