To use this Semel 3931 plastic replacement part, simply remove the old top bar from your Baby E Tire Machine and install this new one in its place. Make sure it's properly aligned for best results. When using the tire machine with this part, avoid applying excessive force that could damage it. For maintenance, clean the part regularly with a mild cleaner to keep it in good condition. If you notice any signs of wear or damage, replace the part promptly to ensure the safe and efficient operation of your tire machine.