OK, this is a new one for me. I've broken dozens of chains and reassembled them without a problem when I strip a bike for a rebuild. Tonight I broke my trusty Park chain tool trying to pop a pin on an early 1970's chain on an Italian bike (a Bottecchia Special, in case that makes a difference.) I tried several links, not a pin on one of them wanted to budge. So I muscled down... and one of the prongs on the Park tool just snapped right off! The pin, however, was still in place. So my question is this: Is there something special about old Italian chains that I'm simply not seeing here? I hate to go out and buy a new chain tool and bust that one too. What am I missing here???