When performing experimental modal analysis with shakers, generally all accelerometers are mounted and cables are run from the structure to the data acquisition system before the shakers are attached to the test article. The shaker set up, stinger attachment, and alignment are usually the last steps in the process. If attached before the rest of the instrumentation is set up on the structure, the shaker could be damaged due to settling of the structure on its soft supports or shifting of the structure during the course of test setup. This will cause misalignment of the shaker/stinger setup which may lead to incorrect measurements. As a result, the shaker is generally the last item to be set up and aligned when performing modal testing.