If you can still find the lume pip, you may still be able to reattach it to your insert.First, remove the residue from the previous adhesive using a toothpick or other sharp object.Then, you can reattach the lume pip with a new bonding substance.If you were not able to retrieve the lume pip after it got detached, you may have to bring it to a watch repair shop as they usually have spares.