As to flying within 1 knot of speed - you are much more proficient than me.
I didn't mean to infer I could fly to within one knot - far from it. No, my query was a simple one and that was did anyone know why Boeing opted to set two white moveable indices (bugs in my language) at Vref on the round dial ASI. On looking back I can only think it may have been because there was a spare bug and nowhere to put it for landing. Let's face it it was a trivial query anyway and probably not worth even worrying about. But thanks for the replies, though.