I was replacing the zinc in my hx today when (as I am reading other posts) I came up with only the brass head because the zinc had broken off, and I could not push the new zinc into the hole as the old one was stuck. I consulted with the yard owner who advised to pull the clean out cover off the end of the hx. My only problem is that there is only one clean out on the hx and it is at the far end of the unit from where the zinc attaches. I noticed significant green crusting on both ends. I am going to pull the hx out this week end to determine if it is salvagable or needs replacing. Does anyone know if the port end of the hx for this motor actually has a clean out or if the end cap is not removable. There is no obvious bolt as there is on the starboard side. Thanks.