Loved the flexibility the design offered. The ability to mount the lever at the end of the shaft and move it completely out of the way provides plenty of torque. Passing the lever through the center of the shaft allows you to tighten and loosen the jam nuts. Also like the center and end locking pins that hold the lever to the shaft. Unfortunately, when I removed the 4th wheel on my small pickup, the 21mm head began to separate from the shaft and actually flexed about 5 degrees off the shaft. It looks like the bushings are pressed onto the shaft, not welded or one piece. I had to stop using it for fear it would come loose once I applied maximum torque. Despite this issue, I like it so much that I keep it to myself and buy a 21mm jack that fits the included 1/2 adapter.