Steering problem in Germany

My brother bought a 1965-66 Mustang several years ago, shipped it to his hometown in Germany and is restoring it eversince. He is having trouble right now with the new steering shaft which is :
1965-1966 Mustang complete power steering conversion kit. Fits 65-66 Mustangs with power steering and 289/302/351W V-8. Includes all necessary components for conversion.
Part # 999023
Hersteller:
Borgeson Universal Company.

He tells me that he has play in the steering, about two centemeters on each side. He further tells me that the flexible rag joint functions at a 100% and the problem is definately coming from the steering (gear, box, or integral gear). He has already adjusted the screw from the gear box which didn’t make a difference. A mechanic at the shop was not successful either.

He wonders if there is something that he missed doing while installing the steering. I wouldn’t put it past him if it were something simple.

Can anybody help?

Thank you, Jen

@Jolli

If you will read page 30, it seems to state that messing around with the adjustments will void Borgeson’s warranty.

http://www.borgeson.com/Images/2013_Catalog.pdf

Perhaps you or your brother should contact the technical support department.