> pressing on a cup, which stood upside down on plastic plate with holes, kinda inverted shower head I think they still use these in bars https://barsupplies.

> pressing on a cup, which stood upside down on plastic plate with holes, kinda inverted shower head I think they still use these in bars https://barsupplies.com/collections/glass-washers https://barsupplies.com/collections/glass-washers