A fastener assembly including a hollow and structurally collapsible stem over an intermediate extending range, a solid end most extending portion being structurally rigid. A receiving portion is constructed of a deformable material having a surface, within which is configured an inner rim defined edge of a deformable material. The inner rim edge can include either of a flat profile or a chamfered shape with a narrowed profile, a diameter of an aperture bounded by the chamfered edge being less than a diameter of the solid end portion so that, upon insertion and passage of the solid portion through the narrowed rim profile, initial deformation of the chamfered rim edge shape preceding alignment of the interiorly hollowed portion, which is subsequently caused to exhibit a controlled collapse by the rim edge in order to secure the stem within the receiving portion.