Katie,
If you pop your head under the front of the vehicle and look directly at where the wheels attatch to the Axle , you will see a large Bolt (The largest one) on the Swivel Housing right in the middle. If you get someone to move the steering full lock left to right you will see that this bolt will come into contact with the axle giving the required 'stop' on the steering. You need to wind the bolt out a bit to stop the opposite tyre rubbing. To find which tyre is rubbing apart from the obvious noise, check the rear of the tyre on full lock it will touch the radius arm and will probably look shiney where its been rubbing. You need to slacken the nut on the inside of the bolt first. Adjust it a bit at a time. If you wind it out too much it will make the Track rod bend a bit on full lock (Speaking from experience)
Cheers,
Jubby
