F threaded brass rod has to be gripped in’ a vice, remember that it should be placed between two pieces of soft wood or otherwise the thread may be damaged.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290328.2.46
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Radio Record, Volume II, Issue 37, 28 March 1929, Page 15
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30Untitled Radio Record, Volume II, Issue 37, 28 March 1929, Page 15
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