What mileage do you get (fuel and oil)?

[GSAX1]

I'm not a material engineer Biscuit, so I admit I'm no expert. You are probably right about the ball race steel.

However the ball race was soft enough to machine after annealing as I described. Afterwards I case hardened it succesfully. The hardness of the case was verified by an unscientific method using a file, which the piece was now impervious to.

Michael