I have what I think is the same sway bar. I just replaced the ball on the trailer's A frame. We had traveled a short distance between a campground and the storage facility. When we got there the friction bar was dangling. The cotter pin was still in it so I looked at the ball. I could see there were score marks made by the cotter pin at various points. Finally the cotter pin had damaged the ball enough that it slipped off. I replaced the ball but it still didn't seem to fit securely. I then looked at the sway bar itself. The ball reciever was deformed where the cotter pin went through it (was no longer round at that point). Got out a hammer and made it round again which made it fit better. I'll have to keep an eye on it but I've towed with it for about 900 miles since with no problems and no damage to the new ball.
This is my second sway bar in little over 2 years. The first one was damaged when the cotter pin came out and the bar got dragged over something at a gas station. Actually had to replace both original cotter pins because they kept falling out.
I didn't bother contacting the company since the ball replacement was cheaper than my frustrtion limit of dealing, as a Canadian, with an American company. And I needed it right away so no time to wait for a warranty replacement.