Especially if you have a smoothbore gun, you may wish to get a Bormann Fuze Wrench for your limber chest.  While not a required piece of equipment for each chest, nor always provided for every gun, these wrenches nonetheless found their way into the field.  The wrenches were designed to fit the unique shape of the Bormann Fuze and tighten it before firing if the fuze had worked itself loose.  These are sand cast in solid brass just like the originals by Rick Bryan.