That's because you don't need multiple threads for the same question.I intended to thank Deerslayer for his link in the 2gen forum but comments were abruptly closed.
Actually, they did at least improve upon it in 2002 or 2003. They switched from a split splined shaft to more of a solid D shaft. When I've fixed up seats in the past I've hunted down the newer hinges to upgrade.Just on a related note, like Old Deer Slayer noted that if you push in slightly to release the pressure on the door, it will never break. Never broke mine on my 2001. The seat handles are also exactly like this. If you lift your body weight off the seatback and try to grab the handle more towards the center when you pull on it they won't snap off. It's a crap design by GM and they never bothered to fix it. I don't think I've seen a driver's seat that wasn't broken in years. I never broke mine after breaking the driver one on my ex wife's 2000 Blazer. My truck was 10 years old when I sold it and neither were broken. Gotta handle their garbage with kid gloves for sure.