Here he is "necking" the piece. That is, with metal "jacks" he is making a groove in the glass at the end of the blowpipe. This will facilitate separating the glass from the blowpipe a little later on.
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Here he is "necking" the piece. That is, with metal "jacks" he is making a groove in the glass at the end of the blowpipe. This will facilitate separating the glass from the blowpipe a little later on.
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