Grind the head of the pin off before use. That one appears to be a well-made one. Pins will sometimes break, if you use it incorrectly, or if you don't grind-off the 'mushroomed' end of the pin.
Take it to a good motorcycle dealer and you can probably find a pin for it. Motion Pro is one motorcycle tool brand which sells replacements, and Pit Posse is another. If you have a Cycle Gear franchise, by you, they may have parts too. https://www.cyclegear.com/accessories/stockton-chain-breaker-and-rivet-tool-kit