A metal cotter pin with two arms passed through a hole, held in place by the springing apart of the arms.
- Two of the design features of the Mills bomb are still to be found in many modern hand grenades - the split pin and the handle which secures the spring-loaded firing pin.
- The split pin was wrenched out by nitrogen-crazed river weed and there you are.
- It was only sealed with a split pin so she opened the envelope and pulled out the documents.
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