Locks are designed to keep honest people out. (Dishonest people can always break a window.) But that doesn't mean that honest people can't enjoy picking them. I've been an amateur lock picker for four ...

When it comes to assembly operations, not all pins are created equal. Press-fit pins are engineered fasteners held in an assembly by the frictional forces and interference fit between pin and part.

The secret to a locking zipper is in the pull tab. You need to flip the tab down if you want the zipper to stay closed.