Countersinking in Ebonite
HEN constructing a wireless set » it is often found necessary to countersink those holes,in the panel which take screws for the panel brackets, of those screws along the bottom edge which help to keep the panel and baseboard safe and secure. If the constructor does not possess a countersinking bit, a good pian is to use a large twist drill. The drill used for making: holes for one-hole fixing components‘ will be found: suitable, and two or three turns of this will’ quickly bring about the desired effect. Do not press too hard on the drill, as it will bite into the ebonite and either leave a jagged hole or else make much ile
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291115.2.63
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Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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117Countersinking in Ebonite Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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