The Man Hole, now deemed a politically incorrect term in some quarters for reasons unknown, is the portal through which one enters the Inspection Chamber.
BTW: It is unwise to post an e-mail address in an on-line forum. They are easily harvested by spam-bots, rendering the address practically unusable in short order.
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An Englishman, an Irishman, and a Scotsman walk into a bar. The bartender turns to them, takes one look, and says "What is this - some kind of joke?"