The large diameter threaded holes in the corners of the Lateral Force Accessory (2D-FP) are 3/8″- 16. These are provided so that you can secure the 2-Axis Force Plate to a surface, or attach feet with that threading.

You can source feet with threaded bolts attached most anywhere you purchase hardware. If you intend to attach feet, we suggest a foot with a large diameter and a grippy surfaces such as this one: https://www.globalindustrial.com/p/vibration-shock-absorption-mount-threaded-stud-200-inch-dia-75-inch-h-3-8-16-thread

The pads on the bottom of the Lateral Force Accessory (2D-FP) are intended to be effective at gripping most surfaces.

Lateral Force Accessory Troubleshooting and FAQs