Burman steeting box adjustment

Yes, i am still struggling with binding of the rocker shaft. My question this time relates to the adjustment of the shaft. I can vaguely remember having read somewhere that the strength needed to turn the shaft (box had been taken off the car) should be about 15 punds inches. Can someone verify this for me please?

Please advise, manual steering or power steering? Model of car?

Hi John, it is a power steering box on a 1966 s-type.