Well just to answer the question........The nuts are actually a thin nut, so the torque figure technically should be lower than a standard sized nut.........I would say 25 Ft lb's at most.........The lack of torque figures quoted from the factory was probably because the amount of leverage was dictated by the length of commonly used spanners from that era and a reasonable amount of pull exerted on this spanner with normal human strength.......... I suspect most of you are laughing at this comment........i think you will find it to be correct of normal engineering practice..........The main issue now, is so few people have this so called "Feel" from a lack of experience.........No need to feel bad about it......It is just how things have become........torque wrenches are cheap enough to buy these days, so if in doubt, use one.