A method of installing a threaded fastener from one side of a hole (20,21) through a substrate (18,19), said fastener comprising: (a) a bolt having: (i) an enlarged head portion at one end, (ii) a threaded tail portion at the end opposite said head, and (iii) a tool engagement portion extending from said threaded tail portion, and (b) a washer-like collar having an aperture therethrough, said method comprising: (a) engaging said tool engagement portion with a bolt engagement portion of a tool, (b) passing said bolt completely through said hole head first from said one side, being the near side of said hole, to the far side of said hole, (c) supporting said bolt on said far side of said hole by way of said tool which is extending through said hole, (d) passing said collar completely through said hole (20,21) while supporting said collar with said tool extending through said aperture and through said hole, said collar being collapsed with portions (46,47) of said collar lying on respective opposite sides of said tool as said collar is being passed through said hole; (e) causing said bolt and said collar to assemble to form said threaded fastener having a head larger than said hole on said far side of the hole, a shank within said hole, and portion of said threaded tail on the near side of said hole; (f) engaging a nut with said threaded tail portion on said near side and rotating said nut to tighten said fastener; and (g) detaching said tool from said fastener; characterised in that said bolt engagement portion and said tool engagement portion engage along an interface, and separation of said bolt engagement portion and said tool engagement portion is prevented by a moveable member which engages said bolt engagement portion and said tool engagement portion across said interface. (a) a bolt having: (i) an enlarged head portion at one end, (ii) a threaded tail portion at the end opposite said head, and (iii) a tool engagement portion extending from said threaded tail portion, and (i) an enlarged head portion at one end, (ii) a threaded tail portion at the end opposite said head, and (iii) a tool engagement portion extending from said threaded tail portion, and (b) a washer-like collar having an aperture therethrough, (a) engaging said tool engagement portion with a bolt engagement portion of a tool, (b) passing said bolt completely through said hole head first from said one side, being the near side of said hole, to the far side of said hole, (c) supporting said bolt on said far side of said hole by way of said tool which is extending through said hole, (d) passing said collar completely through said hole (20,21) while supporting said collar with said tool extending through said aperture and through said hole, said collar being collapsed with portions (46,47) of said collar lying on respective opposite sides of said tool as said collar is being passed through said hole; (e) causing said bolt and said collar to assemble to form said threaded fastener having a head larger than said hole on said far side of the hole, a shank within said hole, and portion of said threaded tail on the near side of said hole; (f) engaging a nut with said threaded tail portion on said near side and rotating said nut to tighten said fastener; and (g) detaching said tool from said fastener;