displaces until the upper d 1 and lower d 2 form an angle of 90 degrees in relation to the clench ring element a and the effective result of this action is represented in fig1 in the third stage of assembly the operator applies a linear dislocation force fc also directly on the middle section namely the inflexion segment d 3 of the fastening clinch element d forcing the upper d 1 and lower d 2 ends to move over the upper latch element a 2 and lower latch element a 3 respectively dislocation comes to an end when there is interference of the inflexion segment d 3 on the relief lock a 4 provided for in the clench ring element a causing effective locking of the anti theft lock product 1 this is clearly seen in fig1 in complement to the preferred embodiment widely described in this document the applicant presents a first variation thereto in terms of constructive and functional concepts characterized mainly by the fact that the assembly can be applied to any kind of trunk lock such as trunk locks with electric components assembled in the body of the lock cylinder element c this can be seen in fig1 15 and 17 in this context fig1 is a representation in exploded view of the elements which make up the anti theft lock product 1 u2032 said elements being defined as follows universal clench ring element x sealing joint b lock cylinder element c.