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Alternative neckring method.....
Remember the dome former from the Workshop Manual (and Radio Times plans)? This gave me the idea of using something similar to create a set of fibreglass neckrings.
This method has never been used before (as far as I know) and the whole thing was fairly experimental. The photo shows one of the wooden 'formers' used to shape the plaster into a ring. This is bolted down to the centre of a board so that it can be rotated smoothly.