thus established will be ground to a close tolerance typically 0 0004 0 0000 however the sleeves dimensions are used as is as audited referring now to fig3 which illustrates a first intermediate stage of the fastener installation relative pulling force has been applied by the installation tool between the pin and the sleeve head causing the nose anvil 40 to react against and push inwardly on the raised abutment 48 folding and flattening the raised abutment to an installed condition where the sleeve head 44 has a substantially flat outer face flush with the workpiece face 62 upon flattening of the conical abutment the sleeve head bore 50 is reduced from its normal aperture to a smaller diameter 50 39 continued pulling force applied by the installation tool as shown in fig4 causes the precision ground shank diameter 26 of the pin to enter and substantially expand the sleeve i d to the diameter 52 39 which in turn creates o d expansion to 54 39 and therefore stretch the structure bores to diameter 56 39 which is the pre determined interference fit condition fasteners of this type must perform throughout a specified grip range to accommodate differences in the thickness of materials to be joined these are well understood and common practice in the art referring now to the sequence comprising fig4 through 6 is the novel method by which this.