Page 1, clause 3.1: delete the last sentence "If required, ... numbers", clause 3.2: the existing text shall be replaced by "The dimensions laid down for the length of the saddle may be decreased by one step using values from the R10 series of preferred numbers." Figure - General dimensions: after "c = multiples of 50 mm", shall be added: "Tolerance on cumulative pitch ±0,2 mm".