I wound up with two Barnett Li'l Banshee bows from a school that was closed. I have three granddaughters who could be able to use them. However, the bowstring is the size of parachute cord or well rope. I have a good supply of NASP arrows that they can use. I would like to get rid of the original bowstrings and replace them with a bowstring that will accept the NASP nock. Any and all suggestions are most welcome. Thanks.