A simple modification of a mystic ‘+’ from Lydia Chen’s Chinese Knotting 2 gives us a nice ‘T’. There was nothing inherently difficult about the process, but I had to retie it a few times because I kept miscounting and ending up with one side longer than the other (not paying enough attention while doing). Also, in trying to keep the stem and crossbar join crisp, I ended up tightening the whole works a bit more that I would like, in final analysis. Maybe I should redo it. If I do, I’d probably take one unit off of each side of the crossbar.
Generally speaking, after a point, I find adding slack back into a knot more difficult than just retying it. How about you?