It might not move with the steering rack. I am more familiar with the simpler steering in a kart. After you would get the right side perfectly straight, you would start to set your 1/8 left side lead. It would pull the right side out of straight without the lock. Also, once you use a laser you will be amazed how inaccurate a string can be...you can get things close, but be scrubbing speed with toe issues. Really saw this in asphalt karts where big MO was so important.
Darin