A guy at the bindery supply counter in Dayton told me to stop pressing my spines flat, and it stung
Ran into him while I was buying 2 yards of linen thread last week. He asked what I was working on and I said a 300 page rebind, and he goes "you're not laying that spine flat in the press, are you?" I said yeah, that's how I was taught. He pulled out his own book and showed me his rounded spine and said flat pressing kills the shoulder and the book won't open right after 20 years. Anyway I tried it his way on my next one and the boards sit way better. What's your setup for rounding a spine without a proper backing hammer?