Can the Friction Knob UMS be attached to a table, bed or wheelchair? February 11, 2021 18:01 Updated Yes, the Super Clamp allows mounting to flat or round (tubular) surfaces up to 2” in size. Related articles Friction Knob UMS Weight Limitation Getting Started With Friction Knob UMS with Super Clamp How Do I Record and Play New Messages on a Multi-Message Communicator? How do I connect a mounting plate to the Friction Knob UMS? BIG Candy Corn Switch is not Activating My Device