coming into contact with deformation element 1030 finally as compression element 109 e g a set screw is threaded into body 105 compression element 109 clamps the components in a set position that is compression element 109 pushes rod 101 against deformation element 103 c and depending upon the size and shape of rod 101 deformation element 103 c and head 103 a against a portion of head 103 a of note during this clamping process deformation element 103 c is deformed e g to form a surface complementary to the portion of rod 101 causing the deformation and the result is improved locking e g of the angular relationship between rod 101 and fastener 103 of further note it is believed that deformation element 103 c is particularly useful in enabling secure locking of cannulated fasteners such as cannulated pedicle screws it is believed that a cannulation without the use of a deformation element according to the present invention may tend to compromise the ability to lock the multi axial adjustability in another example which example is intended to be illustrative and not restrictive rather than driving fastener 103 into bone by itself and then placing a body retention ring assembly thereon fastener 103 may be captured within body retention ring assembly as discussed above and then the entire body retention ring fastener assembly may be attached to the bone e g by using a driving tool such as a hand or power driver to drive the pedicle screw through the hole provided in body 105 between rod receiving channel 105 a and fastener head receiving chamber 105 b referring now to fig3 and.