1.   And when the Navy recovered the jack screw and nut from the waters off Los Angeles, the screw was partly stripped.

2.   He also rigged jack screws with shear pins that broke easily and lowered the car, much like the device Tony Furr was caught using this week.

3.   It is moved on its hinge by a jack screw, similar to the long, thick screw that raises or lowers a garage door.

4.   The design of the jack screw may also be an issue.

5.   The hearings are also expected to consider whether there may not have been enough grease on the jack screw.

6.   The significance of the jack screw irregularities found by the airlines in the last few days remains unknown.