Design and Manufacture of Captive Spring Loaded Screw Knob Fasteners 1.630.569.5007 www.srsindustries.com Fastener Installation Types of mounting comfigurations Retainer Ring SleeveSingle or Slotted Hole Mounting Configuration Retaining Ring Installation Production and Manual Knob Fastener Retaining Ring Installation ToolClick on Button Above. Tooling Modules( Rotating Module)They also make good grasp handles. Tooling Modules( Non-Rotating Module)They also make good grasp handles. Threaded SleeveScrew the Sleeve of the knob into the panel on which it is to be mounted.