Using this Westinghouse cooktop control knob is easy. Simply align the flat side of the shaft with the pointer and then fit it onto the corresponding spot on your cooktop. When turning the knob, do it gently to adjust the heat settings of your cooktop. As for maintenance, you can clean the knob with a soft, damp cloth. Avoid using harsh chemicals as they may damage the knob's finish. If you notice any signs of wear or if the knob becomes loose, it might be time to contact us for further assistance. Before purchasing, always double - check your cooktop's model number and PNC code to ensure this is the right part for your appliance.