u/Massive_Raccoon_1312

I have a several hardcovers where the page block (I think that’s what it’s called) is separating from the spine. I was wondering, does anyone have any tips or tricks for fixing this? Should I just add some homemade wheat paste glue, flip the books so they lay on their spines while they dry and call it a day? Or is it more complicated than that?

I was pleased with this recent haul.