To turn the drivers you must remove them from the axles. I used a punch and hammer to tap them off.
The tread is then chucked into the lathe. You only turn the area behind the spokes. You leave the flange alone and the center alone. You will have to change the orientation of the lathe bit to cut out to the end of the spokes then in toward the bottom of the spokes. I found a photo of the drivers after being turned and put back on the axle
Here's a close up of the back of the driver
This really does require a lathe. I have a Sherline lathe, its small but did this job easily.
