Disclosed are various embodiments of a linkage assembly apparatus that comprise a spring clip that comprises a first end aperture, a second end aperture, and a connector aperture separated between a number of bending lines positioned along a length of the spring clip. The spring clip can be elastically deformed for insertion of a lift rod through the first end aperture and the second end aperture. The linkage assembly can also include an upper linkage rod that extends in a direction longitudinally. The upper linkage rod comprises a socket at a first end and a snap-on connector at a second end. In addition, the linkage assembly includes a lower linkage rod comprising a ball disposed toward an end of the lower linkage rod and a slot that extends along a length of the lower linkage rod. The slot can be used for connecting with a ball rod of a pop-up drain body.