Yes i found the dial, but thinking it must be very low on the torque? how about using a strap around the pinion for about 5times and have weight on the end, check how much weight i need to turn pinion? Thinking it maybe better option with diff. in car. Is there no one selling the friction instrument that MB use?

Yeah it was in my mind about the hardness of the pinion, have been reading the procedure from MB. Its not the cost of the nut that is problem, but thinking its the easy way of fixing this and most "accurate" with old nut back to same position. And if i have one more peen + loctite +180nm it must last for a while, iam not racing with this car. Maybe check the nut from time to time.

Thanks for reply and sorry for my bad english..