if "100% success" means "i can snap them off with my fingers, but it takes a bit of effort" to test roadworthiness, hand them to the gorillas at your nearest zoo. they'll treat it better than your average roadie... (not that i have roadies, well not paid ones) or try the mackie test, run over it with a truck! ok, ok, i'll stop. but anyway, once i drilled the corners on the 6582 i was satisfied with it's toughness.