Dick Hosmer wrote on Nov 12^th, 2010 at 8:31pm:

I've been collecting longer, and published the first half of a guidebook on trapdoors, but he is doing REAL research on an unprecedented scale.

Dick, 40 years of collecting is real research.  How many people can, off the top of their heads, reel off the serial blocks and variations on those?  Very very few.  That wasn't a "guidebook" either and I hope the next one is also that good.  There is a reason I'm ignoring trapdoors....

I guess the real test is I have never seen anyone harsh your book.  Ever.  Which is a sign.