I had the same problem. After looking at the set-up, I think loosening the belt would have helped, even though the HD Service Manual did call for it. Worse yet, my axle was heavily corroded. Like there was no plating. Any others found that?
Just for what it's worth. I've had better luck over the years, a lot of years, by using bearing grease on the axle rather than anti-seize. It just seems to hold up better and last longer. (regardless of what the HD service manual says)