The DIrtyBike LBX Swingarm alignment tool for Ultra Bee pushes the mid shaft out and holds the swingarm in place allowing you to remove the mid shaft without the swingarm falling. 
 
Remove the midshaft nut and use the tool to start to push the shaft out. The tool will stay on the right side holding the swingarm in place. Pull the mid shaft out just far enough to remove the mid shaft assembly and the swingarm will stay where it belongs making installation alignment much easier. 
 
This tool can also be used as a pusher to install the suspension link needle bearings.