Abstract: A mounting system for mounting of a tool having a cylindrical cavity, the system comprising a shaft having a key-zone and a key and a collar against which a spring can be positioned. The system comprises an adapter, with a seat and a keyway so that the drive shaft can be slid into the adapter and can be rotated therein when the driving shaft is slid against the spring in the adapter. After rotation the key is blocked behind a shoulder in the recess.