Pawfly Bike Fork Star Nut Installation Tool for 1-1/8" Threadless Fork Tubes, Professional Star Nut Setting Installer Kit

you need to learn what that top bolt actually does vs the stem bolts. there is NO reason this should have happened. that being said the part that actually broke is easily replaceable. https://www.amazon.com/Pawfly-Installation-Bicycle-Threadless-Installer/dp/B0G423N7T8