Fastener assembly having marginal end portion of body deformed about captured nut

A fastener adapted to be mounted in a hole provided in a wall, comprising:

• an elongated tubular body having a first end and a second end, having an outwardly-extending flange adjacent said first end, having an intermediate portion, and having a thin-walled portion extending from said intermediate portion to said second end, said thin-walled portion being partially defined between concentric inwardly- and outwardly-facing cylindrical surfaces such that said thin-walled portion has an annular cross-section in any plane transverse to the axis of elongation of said body, said body also having an abutment surface facing toward said second end;
• and
• a member inserted into said body through said second end, said member having an abutment surface adapted to bear against said body abutment surface, and having an outer polygonal surface;
• and
• wherein the distal marginal end portion of said thin-walled portion adjacent said second end is plastically deformed inwardly about said member to hold said member within said body.