haa0014 's Japan Review

It is useful if a shaft or tip breaks inside. You could substitute a thumbtack, but no one carries a thumbtack with them all the time.

If you go to play darts often, you should have it.
If you often go out to play darts, you should have it with you. I think it's a good idea to have it with you if you often go out to play darts.

I used it when the tip broke off at the base, but the cutting edge did not reach the broken part. It was a disappointment.