Abstract: An electromechanical lock comprises a rotary knob, a motor built-in for locking and unlocking by way of rotation of a main shaft, a remote control unit for authenticating authorized users prior to granting permission and communicating such information to a driver circuitry which is in communication with said motor, said electromechanical lock further comprising a lock cylinder adjoined to rotary knob through an adaptor portion, having a first and second half-housings divided by a notch in which a rotatably arranged pawl is driven. Said electromechanical lock further comprises a locking pin slot, arranged on the lock cylinder, into which a locking pin can be driven; an adjustment member slot intersecting with the locking pin slot; said adjustment member slot arranged on the lock cylinder, into which an adjustment member can be inserted for blocking movement of the locking pin such that longitudinal length of the rotary knob is arranged.