To remove steering box in a Model B can the tube stay in place and the steering shaft be slid down and out or must the tube come off with it? Would be a challenge to not scratch it.What is the best procedure? Seems like when I bought this car 50 years ago the tube was covered with a snug fitting protective cardboard sleeve (like a paper towel tube) from the firewall to box. I recall peeling the greasy old stuff off to reveal gleaming black enamel underneath. Was this some factory protection during assembly? Ring any bells? Thanks for any input!