In the past, I have strongly recommended purchasing a TT-50 truing tool either with a T4 or soon after. I want to be on record as modifying that recommendation. For those who have not yet purchased a TT-50, I recommend waiting a bit until the new version is available. While the previous version is a very good, useful tool, the newer version is, in my opinion, an improved design. The price has not changed.
I have not received mine, and will have more to say after I have used it. At this point, I recommend waiting until it bocomes available.
I will keep you posted.
Ken