Beyblades may be cool but their tips are easily broken. Solutions for parents vary from buying a $10 (plus shipping) replacement tip to using a 3D printer to print one. In the past I used nuts and bolts in an effort to replace a broken tip. That was a hack that did not work so well for indoors though. So I went to the local hardware store and for €1.80 I bought a pack of fluted wood dowel pins. I cut one in half and kid was happy again.
PS: Depending the diameter, you may need to wedge it with a small piece of paper.