Modal shakers can be bolted to the floor or any suitable base by using the holes located in the base of the shaker trunnion. By loosening the trunnion body, the modal shaker’s angular posi- tion can be adjusted by rotating it in the trunnion base. Ergo- nomic handles are included in some shakers (Figure 7 and 10) to facilitate the task of tighten- ing/loosening the trunnion and rotating the shaker. Often it is helpful to run a bead of tempo- rary adhesive, such as hot glue, around the edge of the trunnion to secure the shaker during testing. This will help to avoid “creep” during testing, which could cause further misalign- ment and measurement errors.