1.   As the bolt is tightened, the wedge forces the collar apart, locking it against the surrounding material.

2.   Align the tank so it is parallel with the rear wall, then tighten the bolts.

3.   If the bolt is loose, but sticking up through the flange, snugging it down with a nut might work, tightening the bolt against the flange.

4.   Once they are on a tower, they have to force huge steel pipes into place and tighten giant bolts to build each level.

5.   Push the wings through the hole and tighten the bolt.

6.   Push the wings through the hole, then tighten the bolt to secure the hook to the wall.

7.   The problem was caused by mechanics using improperly calibrated tools to tighten bolts.

8.   These have spring-loaded wings that open up behind the plasterboard when the bolt is tightened.

9.   This device helps machinists apply the hundreds of foot pounds of torque required to tighten the bolts.

10.   Tightening bolts.