First, we pounded holes into bottle caps with a big nail.
Then the demo crew moved in and flattened the caps with hammers.
We strung them on a thin nail.
And hammered them into pre-dilled holes on a great piece of driftwood. This would work on whatever kind of wood you can scalage in your area.
Some yarn wrapped on the handle, added to the ceremonial aesthetic.
It makes a great, soothing percussive sound. I might add more caps, but it really does not need it. And I do not really need to drink more beer.