...I'm reading more about damping ratio, how to calculate it.

I'm reading the Sylomer's PDF Thomas mention in this post (about form factor bit and the elasticity modulus etc).

Pffiouuu so much parameters must be taken into account.

I'm afraid it's too much for me. At leat I read and read and read for long time. But...I don't have that time.

I will probably go for an easy but not perfect solution though