How much pressure do I apply to a book in a press?

Here is a quick rule that will help:

1. Put bottom aluminum board into a 15 x 15 t shirt press.
2. Close and preheat to 160F (up to copper age) or 135 (modern books)
3. Close the press untul temp comes to seeting
4. Open press, and lay your book stack onto a piece of paper, silicone, or teflon.
5. Top you book stack with a piece of paper, silicone, or teflon
6. Top the entire thing with another piece of aluminum
7. Close the press onto the stack
8. Tighten or loosen the knob until it makes contact with the book.
9. tighten until it doesnt turn easily
10. Open the press
11. Tighten ½ more if humidified, ¾ if dry
12. And then close and run the time.
13. heat press for 600 seconds
14. turn off press
15. les sit until it comes to ambient temperature. about 45 min
16. remive and cold press in the stack about 3-5 days or use a reversion stopper if you have a lot of spine ticks.