i used to use the string leeches but they ocassionally break off the string.so i went to lowes and bought some real plable rubber tubing and cut it to inch and a half pieces then cut small slits in each end leaving about a quarter in in the center untouched then cut it at full length wrapped it tightly around my sting and tighten it down with a small tie down and it works great and is alot cheaper and easier to put on and they are super quiet