Unfortunately, the ball burst suddenly under me while I was working at the computer. The air pressure I have always kept in the range specified by the manufacturer. The exact cause is a mystery.
STRESS I want the procedure in such a case, the manufacturer in Italy necessarily the most customer-friendly is not (but economically secure makes sense). The SELLER "living and feeling" on the other hand has here for imaging services done and found a very customer-oriented solution for me, but my thanks at this point!