The invention relates to a method of attaching a fastener to one or more plastically deformable panels, said fastener including a tubular barrel portion, a flange portion, said method comprising the following steps:
a) locating said fastener opposite a first panel, with the free end of said barrel portion facing said first panel; b) driving said fastener barrel portion free end through an opening formed in said first panel; c) receiving said flange portion against said panel and securing said fastener to said panel by deforming an outer surface of said barrel portion spaced from said free end radially outwardly and against said first panel to form a mechanical interlock between said barrel portion and said first panel, preventing pull-out of said fastener from said opening formed in said first panel. The invention also relates to a fastener for use in such a method and to a fastener and panel assembly.