Using your new stove control knob kit is easy. First, remove the old knobs from your stove. Then, choose the appropriate insert from the kit that matches the shaft size of your stove. Insert it into the back of the black knob, making sure the flat side of the D - shaped insert is in the right position for your stove's control mechanism. Simply push the knob onto the shaft of your stove's control. Remember, if the knob seems loose on a 6mm shaft, apply a bit of silicone sealant to keep it in place. For maintenance, clean the knobs regularly with a mild soapy water solution and a soft cloth. Avoid using abrasive cleaners as they can damage the knobs' finish. With proper use and care, these knobs will serve you well for a long time.