The suspension fork crowns, that I have seen, that use a pinch bolt method to secure the steerer are made of Al. So if a crack were to develop from the clamp being over pinched one would want to know that ASAP. because cracks in Al tend to grow in size far quicker the with steel or Ti. Like I said without a second end of the blades being attached to the steerer when that first end fails it's not good. Sudden loss of steering and perhaps at the same time the vertical support that the fork provides to your body plus your speed equals ouch. Andy