Collapsible Steering Shaft Demystified

I've always wondered why NHRA makes you get your aftermarket seat belts and harnesses re-webbed every 5 years, but will let you run original 60 year old lap belts at antique drags. Having been in the auto repair and recycling business for over 40 years, I've never seen a seat belt webbing fail. I've even pulled them out of fatal wrecks and used them to pull engines. They're extremely strong. There were some latch hardware designs that were less than optimal, but, most were quite adequate and very hard to damage in a crash. Now, some of the late model pre-tensioners are a different story. I would want to re-use one of those from a wrecked vehicle.