Using this stove control knob kit is easy. First, remove the old knobs from your stove or cooktop. Then, choose the appropriate insert from the kit based on the size of your burner or simmerstat shaft. Fit the insert into the new chrome knob, making sure the flat side of the D - shaped insert is in the right position. Finally, attach the knob to the shaft. As for maintenance, keep the knobs clean by wiping them with a soft, damp cloth. Avoid using abrasive cleaners as they might scratch the chrome finish. If you notice any loose parts or if the knobs don't turn smoothly, check the inserts and make sure they are properly installed. Always handle the knobs with care to prevent any damage. With proper use and maintenance, these knobs will serve you well for a long time.