How to get the ball out ?

Hi guys, I have a hard time getting the ball out of the hose port. As you can see on the first and third picture, the ball is secured in the small compartment at the end of the hose port. I should unscrew that part with my fingers i suppose but its too small to properly hold it and i just end up cutting myself. In the past I've been using a pair of pliers and a cloth over the hose part itself to not damage it of course, but there has to be a better way of doing it ? The model is WD Hookah G63-34, bought in Germany, unfortunatly I am not in Germany anymore so i cant really go and ask the guys at the shop. Any advice ?