A wire feed assembly and torch and welding systems are disclosed. The wire feed assembly includes a motor drivingly connected to at least one roll of a pair of rolls. A controller is connected to the motor and is constructed to control the operation thereof. A knob is rotatably connected to the controller and facilitates an operator's adjustment of the controller. A collar is disposed between knob and the controller and is fixedly connected to the controller and engaged by the knob to resist movement of the knob and thereby adjustment of the controller.