Clean all the parts before assembling. I used brake cleaner. Make sure all seals and plastic rings are clean and dry before applying a smidge of power steering fluid before fitting them.
Starting with the steering nut. Assemble the bearing and bearing race in the bottom of the working piston assembly...
...fit the steering nut and tighten with use of your special tool (home made socket – or MB tools) so that the torque required to move it is in the range of 6-10Ncm...
A tip for this bit is not to bother too much about clamping the working piston – work the self made socket against a 35mm socket and T bar. Tighten the 8 sided nut to 200 – 240 Nm.
To do this I used my open ended 60mm spanner on one side of my self made socket and attached my old fashioned hanging scales to a hole in the end of the spanner so that I could measure the torque applied.
Using the formulas given above, for a distance of 47cm between the centre of the open ended spanner's mouth and the hole on the handle, I calculated that my scales should be reading between 43 kg and 52 kg to apply the correct torque.
Please note unlike a torque wrench, calibrating scales is quite easy to do so long as you have some known weights to test it. This might look like a bit of a dodgy way of applying a torque but if you are careful (and you have to be) you can safely apply a torque as well as you might with a torque wrench – in absence of a torque wrench – particularly if you are given a nice wide range between 200 and 240 Nm.