1.   The jury has been told that locking pins which should have secured the gantry had failed.

2.   Commercial versions of this technique are available as rod locks, security bolts, or locking pins.

3.   Finally, officials said, Jones could not be locked in his recreation cell because the locking pin on the cell door was already in the locked position.

4.   Those locking pins can fall into the locked position when a cell door is slammed too hard or when a door is closed too slowly.