Bought a used midrange unit to replace a wore down mid range unit on my biwired KEF 104/2 speakers. The upper mid surround has a cut/damage as seen on attached pictures. As far as I could research, these midrange drivers are unreplaceable? ( Correct me if I'm wrong). Will glueing this with proper flexible adhesive be a solution to prevent further damage? are there any options to fix this? Or Am I in a rut and just return it( ebay transaction) thanks.

