I offer a precisely machined metal replacement for defective plastic at the bell. You can use either stainless steel or anodized black and silver. The offered piece fits exactly on the Shimano Ultegra 14000-5500 Ci4 XTB, XSC, XTC, XSD, XTD (Ci4) XSC + XTC Ci4 Large Btr Ci4, X-Aero 6000-10000 RA.