Abstract: The upper end of a shank of an earth-working tool is secured to a frame or tool bar by a spring-loaded clamping arrangement which includes replaceable pin and bushing components in the pivot connection between the shank and a clamping member secured to the tool bar. Spring loading is provided by a compression coil spring through which a connecting tension rod extends. A relatively hard plastic sleeve is pressed onto the tension rod and serves to keep the coils of the spring in alignment during earth-working operations. The bushing component of the pivot connection is axially split with circumferentially spaced surfaces separated sufficiently from one another to permit locking tabs to be disposed therebetween. The bushing fits in aligned bores in a rockable member secured to the upper end of the shank and the tabs extend from the rockable member into the area between the circumferentially spaced surfaces of the split bushing.