Power steering box Pullman nut also steering wheel not straight

Spent today changing my long leaking steering box which went ok I would like to replace the nut on the pitman arm but cannot find the part number I have put the old one back on for know but I'm not. 100 % Happy with it
Took it out for a test drive and the steering wheel is about 12% out what the easiest what to ajust this

nuts can be used many times as long as in good condtion ,did you fit locking washer ?, centralise steering box using pin up through drop arm rear up in to box or count turns lock to lock and set central , check were steering wheel is and correct if not central too,steering wheel and box are now both set correct to each other, then go for a drive again check steering wheel alignment and if wrong adjust drag link to correct

Nut was very rusty centred box with 8mm drill bit

darrenm said:

Nut was very rusty centred box with 8mm drill bit

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and where was steering wheel whilst box was centered

I thought centred

darrenm said:

I thought centred

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In that case, take the pin out, turn the steering wheel so that the road wheels point perfectly straight ahead then adjust the drag link (front steering bar) until the steering wheel points straight ahead also.

darrenm said:

I thought centred

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if steering wheel is central when box has pin it it adjust drag link, i drive the car note where steering wheel is when driving straight ,keep steering wheel in that position when car is stopped adjust drag link to center steering wheel then retest up the road and re-adjust if necessary ,then all 3 are in center position pas box steering wheel and road wheels