It seems the rise on the smaller thread on my current ball-head is not fitting and also its too small and the bigger thread is too big to be possible to fit. I must find a mean of measure it. Something strange here, might be changed by previous owner. Looks like it can be opened but i do not have a wide enough screwdriver at home to open it.
ADD:
I got it opened and the thread seems badly damaged, must have got some real force on it. Must therefore get another thread adapter for it. Thanks for the help about my problem.