Soldering iron had no "ON" light, and the screen has no backlight, so I added a Neon indicator to show that it's on, to prevent it being left on overnight...
A large pipe cap and plug, machined to create a pot for easy application of cutting oil. Based on AvE's found here: watch?v=q__AZjcdBUM
I was gifted a second-hand digital caliper whose auto-off function no longer worked reliably, leading to rapidly drained batteries. A small switch was installed in the data port to manually kill the power.
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