Because these traditional shakers were typically used for base excitation, the armature attachment configuration was not optimal. Usually, some type of left-right thread arrangement was made or some type of collar was designed to enable an easier attachment to the shaker. It was a rather difficult arrangement no matter how the connection was made, given a threaded interface on both at- tachment ends. In addition, there had to be some thought given to shaker position and actual length of stinger needed. If a different length stinger was needed, then the shaker needed to be reoriented and realigned, or different stinger lengths were used for the modal test. Overall, the setup of the traditional shaker for a modal test was very difficult and cumbersome.