As Robbie said above.......
Roadsters of that era had Devol bushes and steering damper blades. The track rod angles were compromised leading to bump steer. The first owner of my Roadster was so unhappy with the steering feel that he had some quite direct exchanges with MMC, because he thought it was dangerous. The outcome was that before I took over, the stub axles were replaced with bronze bushes, and this levelled up the track rods, thereby improving steering feel. Now my Roadster track rods are almost level, and the track rod ends are below the steering arms.
A 2004 Roadster will more than likely have had a kingpin change, so may not still be to original spec.
What puzzles me is that the S1 Roadster continued most of the Plus 8 specification. Mine even has front springs marked Plus 8, and yet I've never heard a Plus 8 owner of the 2000 era complain about bump steer. Maybe the steering rack was moved.
