How much weight can the Friction Knob UMS hold? Ed Clausen February 11, 2021 18:01 Updated The mount is designed to support up to 5-lb/2.3-kg. Related articles Does the Friction Knob UMS swivel to allow easy access in and out of a wheelchair? How much weight can the Latitude hold? How much weight can the Gooseneck hold? Comments 0 comments Article is closed for comments.