While installing the (fadtrack09) channel and frequency counter kits the old volume and am/ssb potentiometer/controls went south. Thay both operate but are able to be pulled out a 1/4" then back in again. Thay won't come all the way out but I'd like to replace them. Thay had never been removed since factory and the part that holds the shaft in place was rotted and cracked. Does anyone know where I can purchase replacements? Thanks