Aftercooler zinc in Cummins QSB

Has anyone had a problem with the brass collar for the anode spinning in the aftercooler cover on Cummins QSB ? If so, is there any fix other than replacing the whole cover with one that will likely have the same problem?

Another question: How is it possible for the aftercooler zinc to be effective when it is not connected to the bonding system and is mounted on a composite material that I think surely must not be electrically conductive?

Yes, the B series motors, I have QSB 6.7 motors, have a cover on the ends of the aftercooler that is made of a composite, non metallic, material. I have heard it called Bakelite by Cummins employees. Bakelite is quite non-conductive and was used as electrical insulators. Now, there may be a wire that bonds the anode through the bakelite to the body of the aftercooler that I have not seen but without connecting the anode to the metal of the aftercooler, I don't see how it could work. Since I have not seen any evidence of non-performing anodes, I am presuming that there is indeed some way the brass ring that the anode screws into must be connected. Or, maybe the Bakelite is not Bakelite and is instead some conductive material. Whatever it is, it is not very good at holding the brass fitting as I have now had two of them spin when removing an anode.