The heater blend slide and cable have always been stiff since new. Now the attaching "white button" on the bottom of the heater control came off. Please see pics. I do not know how to reattach. It does not snap back on for me. Is the "white button" broken. Any ideas? Thanks in advance.
PXL_20210112_113033709.jpgPXL_20210112_113012357.jpg
PXL_20210112_113033709.jpgPXL_20210112_113012357.jpg