Textblock repair when spine/pastedowns are intact

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I have a ~20 year old casebound book where a section of the text block has separate in two places on the head and tail. The pastedowns and spine are completely intact. My first thought to fix this was to somehow apply PVA down the hollow without getting any on the spine but the hollow is very tight. Is the only way to cut apart the pastedown to expose the back of the text block, repair it, and then reattach the pastedown? I’m hoping to not cut the hinge that is in very good condition. Please help.

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    Posted by (Questions: 1, Answers: 0)
    Asked on February 7, 2022 8:18 am
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    First, you may as well finish separating the pages. That will make it easier to get in there and create a fix. I would scratch up the back/text-spine  a bit of both "halves" and then attach a new paper spine liner first to one half and then carefully close the book to attach it to the other side. I hope that makes sense.

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    Posted by (Questions: 1, Answers: 220)
    Answered on February 9, 2022 8:11 pm