When I came home after two weeks vacation, I saw a big fat low sacrifice branch on my prunus. I realized it´s fat enought for my taste...Well, my father-in-law fed and watered really good :)
I cut the appex immediately. If I let it grow till the end of the season, It would surely gain more thickness. The diameter was 17,21 mm.
The next thing I realized was that I first had to work on the ramification of the branch closer to the trunk, and just than let it grow freely. So, I will cut part of the new low branch closer to the main trunk next spring and start to build new branch structure.