Abstract: A cylinder-lock assembly configured to allow affixing accessories that are designed to be operatively coupled with a standard European locking cylinder to operate an American mortise type lock system. The cylinder-lock assembly includes a cylinder-lock-member that includes a cylinder-housing having an external shape of a European cylinder-housing, and a cylindrical lock core. The cylinder-housing defines a cylindrical through bore configured to receive the cylindrical shaft, and the cylindrical shaft is adapted to rotate there inside the cylinder-housing. The cylinder-lock assembly further includes an adapting-ring, a cylindrical American housing and a rotation-conveyor, configured to operatively convey rotational motion of a fitted key, which is disposed inside the cylindrical shaft, to an American-lock type cam, to thereby actuate the door lock/unlock mechanism of the American type mortise lock.