Google has a number of images of the "James" tailpiece. The main (hinged) body is cast rather than stamped and the top has a pair of lugs which engage with two neoprene O-rings to keep it in place. The closeed top, together with the 0-rings, keep the string from slipping off the hook but it's still worthwhile using a capo to stop the loose end swinging around whilst you deal with the tuner end. Price? Think north of $150 for the basic model and, if you can find a supply in the UK, let me know where!
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