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This is how I hurt myself with a magnetic drill and what I could have done to prevent it. This video contains a simulation of equipment malfunction, so definitely don't try this one at home.
Different ways to differentiate between Magnesium and Aluminum. Johannes shows us how to tell with vinegar, arc shots, and visual cues
Helpful tips for 6013 padding with Matt Hayden
Sam removes a bearing with a gouging tip and more in this real world repair video