[Jewelry making - Article 00093] - Re: [Orchid] Old Wax injector

[Gary Dawson]

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    Two things come to mind with the hole in the top of your old wax
    injector. One is that it may be for a pressure relief safety valve,
    but are you sure it is a threaded? Most wax injectors have a tube
    that connects to and penetrates the top, the tube is sealed at its
    lower end which sits an inch or two above the bottom of the wax pot.
    This exists for the insertion of a thermometer and facilitates an
    easy read of wax temperature without the hassle of a remote measuring
    device. 

    Hope this helps, G

Gary Dawson
http://www.goldworksart.com
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