How much weight can the Friction Knob UMS hold? April 01, 2022 12:54 Updated The mount is designed to support up to 5-lb/2.3-kg. Related articles Getting Started With Friction Knob UMS with Super Clamp Is My Product Covered Under Warranty? The colored switch cap comes off while using the Big Red. Is there a way to secure it so it doesn’t come off as easily?