When rebuilding RHD & LHD steering boxes with new parts , twice we have found that zero free play is when wheels are at 11 0clock LHD & 1 oclock RHD, An ajustable drag link allows you to set zero free play in straight ahead position, You can cut a tie rod & re thread one end to take a another tie rod end , may be a clearance issue so need to check.As this has happened twice i know of its, posible that repo sector is slightly out. No doubt if you have built a number of boxes using repo parts you may have encountered this , let us know here, We have supplied a number of RHD & LHD ajustable boxes to custmers,Plus other RHD parts , Derek from sunny Nelson.