Every Moving Part: inside a pin-tumbler lock

Field notes

The lock page separates the plug, housing, pins, springs, and shear line, then lets readers adjust cut depths and turn the key in the drawing. Its explanation of picking notes that imperfectly aligned pin holes let one pin bind before the others; the diagram itself uses perfectly aligned holes and cannot show that effect. The site also lists lessons on a flush, watch, refrigerator, and freewheel, with a zipper marked planned.