would tend to transmit a very strong stress from one component to the other u2014 the oscillating assembly va and the cabinet c u2014 between which it is rigidly positioned with the risk of serious damage for their integrity the presence of the said holes 7 and consequently the capability to suffer non traumatic elastic deformation allows the cylindrical stem 1 to operate as shock absorber and instantaneously absorb in its structure through a limited reduction in length most of the stress that would be dangerously discharged between the oscillating assembly va and the cabinet c of the appliance a similar intrinsic shock absorbing capability is additionally developed although with different technical functional solutions in the embodiments of spacer d illustrated in figures from 3 a to 4 c the embodiment of spacer d illustrated in fig3 a 3 b and 3 c is characterised by the special configuration given to the collapsible section 40 of the cylindrical stem 1 it is provided with a through transversal notch that in plan view has a basically n shaped profile that comprises two thin longitudinal sections 40 a 40 b obtained in opposite position near the lateral edges of the cylindrical stem 1 and connected by means of a central oblique section.