Yes yes yes, but the article is slightly different in showing, but not exactly explaining the plug in the main. I get how it is done but the article as I viewed it seemed to stop short of it all.
I do realize the plug in the main is the same passage way that is described in the MP books up top driver side they suggest to counter sink a female Allen plug into after you tap it to accept it.
What size Allen plug they would use in the main and proper tap size etc... was not mentioned. I do not see a page two to click on.