Trust me, when you treated bikes like I did nothing could hold up to it then. When we started riding again in 93 all of the bikes were flimsy crap 80s junk which continually broke. That was why the "mid school" happened and why companies like G sport came about. We also switched from 10 mm axles which continually bent or snapped with pegs on for 14mm and so on. Quill stems aren't made for that. I've seen them snap clean in half. I rode a Standard Byke Co Shorty down a two storey high fire escape and couldn't pull up at the bottom which was on the grass. There was a depression in the mud and because the steps shook the crap out of me I couldn't get the front wheel up. In it went, producing an almighty crack which sprained both of my wrists. I thought the head tube had snapped but it turns out the bearing cup shattered, peeing broken bearings and pieces of steel out. The frame and fork were unharmed. Like I say, I'm talking abuse. Like serious serious abuse.