Joe, from looking at it, it seems to be the same carrier as other Nationals use. I tried to take it off, but it would not pop off. Don't know if there is something holding it in place and it needs to slide forward, but that would require taking the shaft and other stuff off, and I did not want to go that far. With the way it was sticking, I could see how it could get bent -it would easily pivot up and slide back and forth. It really looked like pushing would cause it to pop off, but I only tried a little bit so I didn't end up with a bent holder.
Though I know when I took one off an older National (older style holder though) that one came right off.