the male part 182 includes a tapered bottom 194 the tapered bottom 194 permits substantially a greater degree of flexibility in assembly and the angle of the taper influences such flexibility as hereinabove noted after the assembly takes place it is necessary that the spring have sufficient force to snap outward and create the actual locking action that keeps the male part 182 and the female plate 184 together in addition an outward groove side wall 198 may be disposed at an angle u03b1 for the purpose of preventing the spring 190 from vibrating out of the groove 192 and further provide a greater degree of reliability of performance the spring 190 may be sized so that it is compressed in a manner that the coils will butt or nearly butt as shown in fig1 d to provide for effective electromagnetic shielding and improved electrical conductivity between the male part 182 and female plate 184 as well as provide improved thermal dissipation and environmental sealing in this configuration destruction of the spring 190 may be necessary in order to separate the male part 182 from the plate 184 the tapered bottom 194 may be a compound surface having a plurality of angles u03b8 as illustrated in fig1 c as shown the compound surface comprises three contiguous surfaces 202 204 206 which are configured for controlling the locking.