How to Attach your Gitzo ball head to a tripod

In my Gitzo GT1541T tripod review I mentioned the ball head sometimes comes loose. This is because I could not tighten the ball head tight enough on the tripod legs. I considered using Loctite, but did not use it because I would have to clean the threads when I want to unscrew the ball head (to use it on my Gorillapod).
On YouTube I found a tip which seems to work. The trick is to push down on the ball head when you tighten it on the tripod.
Take a look at the video below where it is explained in more detail.