I have the stock early one piece steering shaft on my 71. The shaft is inside a tube that runs from the steering wheel all the way into the manual steering box. Once I remove the manual box and install the mini truck box, I have to cut the shaft and tube back and the tube will no longer be supported by the box. What have people done to secure the tube? I was thinking about installing a bracket at the firewall with two U bolts to hold it. Any ideas?