I used a tap with a motorcycle engine, purchased for the purpose of removing the tip. If you do not surely put the four claws in the middle, it will bend easily. There is no problem if the strength of the nail is a bit stronger.
Three claws seemed to be bad for evaluation and hesitated to purchase, but I bought it as an optimal tool to eliminate a tap without breaking the threads. After applying heat to the base material and carefully taking time, I was able to take it out safely. Although the nail broke once on the way, the one that got shorter got stiffness feeling and it was easy to work. Because it was an expensive part, it was saved because it was pulled out safely.