hole in the plate in which a counter sink or bevel 5 is formed at the upper and lower surfaces of the plate the effective plate thickness is shown by numeral 6 the relationships established in respect of fig3 apply to the plate of fig4 where the effective plate thickness 6 is used as the value of plate thickness t in the various expressions fig5 is similar to fig4 but shows the edge of the hole with a curved contour here also the effective width of the plate is shown and its value is used in the above expressions for thickness t in order to produce the holes in the plate without 34 walking 34 of the drill the holes can be produced by a laser beam it can be seen that a hole of size h and directed at angle u03b1 will not only allow an asymmetric variation of insertion angle of the fastener between the range u03b8 1 to u03b8 2 along the axis of the hole but additionally allow some symmetric variation of the insertion angle of the fastener from side to side in a plane that is perpendicular to the axis of the hole as the hole is slightly oversized in relation to the maximal diameter of the fastener it will be noted that further reduction in the side to side translational movement of the fastener within the hole may be achieved by narrowing the hole along this.