One way to align the shak- er during setup is to use the stinger. In setting up a shaker test, typically the stinger is slid into the shaker’s through-hole armature with the force transducer or impedance head attached to the end of the stinger. With the shaker collet loosened, the stinger can be extended in and out of the armature to obtain the desired length. Once this is done, the force gage or impedance head mounting pad can be affixed to the structure as explained previously.