Abstract: A drive apparatus suitable for a power seat adjuster includes a rotatable lead screw disposed between an upper track movably mounted with respect to a stationary lower track. A drive block is rotatably mounted in the lower track for rotation about an axis extending perpendicular to the lower track. A first bore extends through the drive block for receiving the lead screw carried on the upper track. An insert body is movably mounted in a second bore in the drive block, the second bore extending transversely to and intersecting the first bore. A transverse, threaded third bore formed in the insert body threadingly engages the lead screw. The first bore has a larger diameter than the diameter of the lead screw to permit pivotal movement of the insert body and the lead screw about an axis extending through the second bore.