Tailpiece attaching arrangement and lock arrangement

A tailpiece attaching arrangement comprising:

• a cylindrical frame having an internal space configured to receive one end of a tailpiece, the cylindrical frame further comprises an internal thread on an internal surface-, and a hole on an outer surface extending to the internal space;
• a cylindrical attaching member having an external thread configured to be coupled with the internal thread of the cylindrical frame, and at least one locking protrusion extending substantially in a longitudinal direction of the attaching arrangement;
• and
• a locking member configured to be removably coupled with the cylindrical frame, wherein the locking member is configured to extend through the hole of the cylindrical frame into the internal space and contact with the at least one locking protrusion of the cylindrical attaching member, wherein
• the cylindrical attaching member is configured, when coupled with the cylindrical frame by the threads, to prevent removal of the tailpiece from the internal space, and the locking member is configured, through the hole, to contact with the at least one locking protrusion of the cylindrical attaching member to prevent rotation of the cylindrical attaching member in relation to the cylindrical frame at least in a first direction.