Thank you - 'zinc' was the word I was looking for. But these instruments always fool me - I never did master the art of making a tea-chest bass, and making a lagerphone is still an ambition. But there is an idea of some of us getting together in a gospel/skiffle band, so perhaps...! (The gospel/skiffle, I might add, was inspired by that incredible live album of Lonnie Donegan, Van Morrison, Chris Barber, and Doctor John - Wow) - Ian B