I bought the book as a 1.5 from heritage (fc was detached)..it was never a 1.8, I'm afraid... an action 1 had just recently gone from 1.5 to 2.5 by having the FC "taped" back to the book... so I figured I could do the same thing...
and so, added just a sliver of tape and had it graded...came back 2.5 (there was already a precedent set with the action 1)...
keep in mind, this was 6 or 7 years ago, before cgc's stance on tape changed...wouldn't work in today's environment, and I believe book would still be a 1.5