Hi, I have an origonal coned gold label JBL D120F Signature speaker and it has a small radial tear to the speaker . The tear shows signs of propogating further, but runs to about 2". The tear would only propogate to the 'glued' area and not into the speakers center. The tear is on the outer 'glued' and formed part of the speaker and about 1/2" in from the speakers edge. Could I repair this? and What's the best method and materials to do it please? Also what's best to clean up the cones - dust and dirt evident.