Am I missing something here? When I replaced the castor arm bushings recently I learned that the nuts at either end of the rod were to lock down the ball joint and fork. I removed all the other tie rods yesterday. Are all the nuts on all the ends of all the rods the locking mechanism? I can't seem to budge all but two of them. The nuts on either end of the long central tie rod won't budge. Is there a trick? Should I apply heat? I feel like the real nut is on my end of the wrench!