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That reminds me Pixel - I missed out a step. You need to get it hot first - boiling in water does not work - water does not get hot enough. So it was boiled in oil. Yet more oil! And boiled in...

Lets not forget that most if not all old horn scales were formed by heating and clamping in a vice, At the heats used thermoplastic horn nearly melts, some old descriptions of the clamps mention...