Joe Alan If you get that used one you might take a can of WD40 remove the knob,press on that cone shaped spring button and pull the knob out. Gotta do that to get it out of the truck ! Put the tube on your WD 40 as deep as it will go in the switch,spray and pull it out to lube the dry switch. Don't think WD will hurt the switch,sure frees them up .
