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I see nothing about grimoires.

Can I use the rules for "Contest of Wills" for other contests too?
Like Strength vs. Strength (arm wrestling)

the rules sometimes mention such contest, but they are not
explained in the rules, except in "Contest of Wills"

No problem. The rules are very very similar, with a few minor differences.
The magic system is a bit different. No more thread weaving.

"The magician may attempt to divert Strain to the grimoire. This is voluntary, not required. Make a Spellcasting Test against the Mystic Defense of the grimoire. One point of Strain may be sent to the grimoire per success. Each point of Strain routed to the grimoire reduces its Barrier Rating b...

okay okay

but where can I find the sturdiness ratings for different grimoire materials???
As I told you, I have the normal paper grimoire in mind, bound in leather.

I have the normal paper grimoire in mind. Normally a grimoire is a book and books are
made of paper.

Please tell me more. On what page in what book is a list of grimoire materials?

What is the Physical Defense, Mystic Defense, and Barrier
Rating for Grimoires???
Can't find anything in the Player's Guide.