I've been refurbishing an SB 13 toolroom lathe made in 1971. I'm now working on the last major assembly, which in my case, is the tailstock. I grabbed the only #3MT tool I currently own which is a dead center that I previously used in the headstock of a smaller lathe. I find that when I fully retract the tailstock quill, the tailstock screw does not come forward far enough to "bump" out the center. In fact, the tailstock screw is nearly 1/4" short of making contact with the back end of the center. Now what I want to know is which part is wrong - the center or the tailstock? Should I just buy another center along with a new MT3 shank for my drill chuck or will I need to do some additional work on the tailstock to get things working right?