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20-12-19, 05:56 PM #25
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diamond-pointed drills
Diamond-pointed drills are today commonly used for drilling glass and [glazed] ceramics. They are preferably lubricated with liquid paraffin.
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Thanks and thank you for the history lesson. Kevin Moreau, an exceptional U.S. blacksmith has a video on making a "pinched bow" key so I thought I would try that technique on this key.
Coffer Lock?