(3/4) The Simpsons Arcade1up Cabinet Light up LED Coin Door Modification - Part 3: Safety First!

Would you like to modify your Simpsons Arcade 1up cabinet to have light up coin doors? Well, this isn't the best place to start, but since you are already here, you might as well watch and like the video.
Part 1: Introduction Video
Part 2: Tools Required
Part 3: Safety First
Part 4: The actual work and testing

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We ready!!!