I struggled mightily trying to keep cottered cranks on my bikes tight on their spindles when I was a kid....After all the smashed, mushroomed and stripped and stuck cotters I went through (yes, I was just a kid that had only hammers, flat bladed screwdrivers and a big adjustable wrenches available for tools after all....), I never want to ever deal with them again since I discovered non-cottered cranks in college....

Chombi