both the motor and cradling feature regions a circumferential latch 9 can be seen in fig3 and 4 this latch engages the tabs 1 after they are rotated against the stops in the recesses described above this latch deflects in the radial direction alternative latch designs could deflect in the axial direction another preferred embodiment is shown in fig5 where the cradling features 6 extend in the opposite axial direction than in fig1 4 the axial and radial retaining surfaces on the motor mounting structure 3 4 5 may be formed differently due to considerations necessary to the molding of the motor mounting structure however the elements described of the configurations shown in fig1 4 generally apply to the configuration in fig5 and the elements described in the above two embodiments can be adapted to a number of design variables such as the insertion direction of the motor the relative axial positions of the cradling feature and the twist lock features and the axial direction in which the cradling features extend from the structure of the motor mounting structure in fig6 tabs 1 are inclined they mate with inclined surfaces 4 in the recesses on the motor mount to form a screw mount this allows for an assembly which is both rigid.