A book repair guy in Ann Arbor showed me one fold and it fixed my sagging text blocks
I was at a small book arts meetup in Ann Arbor two Saturdays ago and got stuck talking to a retired conservator named Walt who had been fixing books for 40 years. I mentioned that my case bindings kept coming out with a saggy text block, and he grabbed a scrap signature and showed me how he taps the spine edge square on the bench before sewing, not after. He said the block settles where you let it settle, so let it settle square from the start. I tried it on a rebind of an old Reader's Digest condensed book that night and the difference was instant. Anyone else got a small habit like that, something an old timer showed you that sounds too simple to matter?