Using a shaker-stinger-structure setup for excitation is a common method nowadays for acoustical testing, however, the geometrical and material properties of the stinger and its fastening method can induce unwanted artefacts to measured characteristics. These uncertainties were artificially reproduced and their effects on the driving point mobility (DP) and frequency response function (FRF) were examined. Stinger buckling phenomena was found to have significant effect both on DP and on FRF. More parameters were investigated experimentally and analytically, which have influence on the buckling phenomena, such as the stiffness of stinger end mounting, axial or radial pretension or slightly bent stinger shapes. The effect of these artificial errors were directly quantified. Furthermore, practical failures - as loosening of threaded mounting adapters - were reproduced and evaluated too. As a consequence, direct practical suggestions for stinger applications were formed, considering the excitation force and frequency range of interest.