Sometimes the worst happens...sometimes we crack or break a bump key. But hey???It wouldn't have happened if you weren't trying to use it right?? 9-11 Training can provide replacement bump keys as a singular item. No need to purchase and entire new set when you can simply replace your KW1 or Y1 as needed. Simply let us know which one you need and a new one will be on its way as soon as it can be cut. What could be easier?