permitted due to the difference in diameters between the circular mouth 224 and the circumferential neck 212 alternatively or additionally the circular mouth 224 may be a relatively tight fit around the circumferential neck 212 with rotation being permitted due to the resilient nature of the retaining clip 206 the head 204 may be of any relevant lever in a brake assembly for example it may be the head of an adaptor lever as shown or the head of an op shaft equally the push rod 202 may be the push rod of an actuator or an adaptor thus in other embodiments the push rod 202 may have the circumferential neck 212 at both the first and second hemispherical ends 208 and 210 respectively to be releasably secured to both an adaptor lever and an op shaft lever the push rod 202 can be disassembled from the head 204 by axially pulling it with sufficient force to widen the circular mouth 224 to pass over the hemispherical head 208 the force required to disassemble the push rod 202 from the head 204 is significantly higher than the tension forces that the joint between the two will experience in use thus making it extremely difficult for the components to become separated accidentally fig8 shows part of an alternative retaining clip 300 substantially similar to the retaining clip 206 but with projecting fingers 302 spaced circumferentially around an orifice 304 at the base of a frustroconical projection 306 an orifice outer periphery 308 has a diameter larger than a push rod cylindrical portion diameter not shown whereas an inner periphery 310 defined by distal ends of the projecting fingers 302 has a diameter.