We can't spend every one of our lifetimes in a Buddhist Monastery or Convent, participating in ancient esoteric rituals. So don't judge yourself or others about how pure they are, or how perfect your seven metals may be.
We would get bored and stuck. Enlightenment can arrive in many different bodies and times. After all, if this world is all "maya" (illusory) then why be stuck on a place and style of devotion and spiritual teaching and communication.
So let us embrace the use of the tingsha in modern times - Hail to the Kundalini Kids! The Yoga Classes reviewed on Yelp! The Beverly Hills Buddhists! The Zen Teaching of the Zipline!**********
As ancient as gongs, these cast bronze and other metals provide focusfor the mind and emotions and bodies.
Bring clients back to their bodies with bells.
Balance the lobes of the brain. Inspire their devotional side. Bells do all this and more.