Quaife Steering rack tuning problem

[filh]

A rally friend of mine bought a quick steering rack from Quaife some months ago . He did not fix the steering rack on his car and meanwhile crashes the ae86 into a (crossing road) wall .
As he was absolutely desesperate , he sold the car . And I bought the steering rack from him .
It's new and in the box , never open !
I fixed the rack into and old but working housing with new bearings .
I had a try on road and find it impossible to drive . Hard points and no steering return in corners .
All tunes have been made as in workshop manuals .
So I try to find why .
Do you ever had same problems ?
I was thinking about the rack guide (part n°:45523-20040) that might be out of shape and could'nt fit with the new main axle?
Sorry for that long post

Regards
Phil