Rugo,
Yes I do have the infamous 48 to 51 includes 52 supplement manual, but in particular case I think they could have added at leat one picture. On page 3-2 they have a cut away but does not identify the plug. Then on page 3-8, they say "remove either top or bottom plug". I'm sure that I am not the only 1st timer in kingpin replacing that would question just what is the plug.
It's much cheaper to ask a question than to had wished you had done so before ruining a part.
Overall the manual is fantastic. My pages are starting to fall apart due to usage
