Thanks. I haven't taken the steering box apart yet, but will do so carefully

The other problem we found was that the passenger side top A- arm is bent, and the bottom may be very subtly bent too, although it's hard to tell. The car was in an accident before I owned it and it was hit on this side. Many of the bolts on this side are also tweaked probalby for the same reason (the car was smashed on this side) and thus have worn very badly and unevenly and need to be replaced.