If you have waited too long to replace your pencil zinc, it/they may have
corroded down to the point where you may have to drill them and use an
'easy-out' to remove.. Might be simpler, in this case to just purchase the
zinc and plug as a unit. I see them that way at the marine store, zinc
section.


--
My opinion and experience. FWIW

Steve
s/v Good Intentions