An assembly 10 and a method 200 which utilizes the assembly 10 to selectively and structurally strengthen and rigidize and/or stiffen a member 150 which is operatively disposed within an article of manufacture, such as an without limitation, a vehicle. Particularly, the assembly 10 includes a selectively expandable portion 18 which is stretched along an inflation wand 12 and is then inserted into the member 150 via a relatively small aperture 155 formed within the member 150. Selectively expandable portion 18 is then inflated with a material 52 to support the member 150.