Amazing Door Lock! DIY Making Secret Door Lock with Nut Bolt I Coded Door Lock Elon Musk holds unprecedented Pentagon talks, wants leakers prosecuted Trump Picks Boeing Over Lockheed Martin For $ ...

Unless you are a mechanical engineer, you might not realize there’s a lot of nuances to something even as simple as a nut and bolt. How many threads do you need to engage? Do lock washers work?

Typically, we’ll throw a simple helical spring lock washer on a stud or bolt, torque down the nut nice and snug, and call it a day, feeling like we’ve made a secure joint. But nothing could ...