u/Bobby_Obiviously

My aunt asked my to fix her skates because they weren’t rolling. On all the other wheels I was able to loosen the nuts to have them roll nice. This last one is not working with me. I’m going to get new nuts tomorrow, but this last one will not come off. It was rounded the last time she had her wheels changed. Is there any tips I can try? Or what is the name of the pin so I can buy a new one?

Thanks 🙏