With the Ryobi trimmer, the line replacement needs to use either a 0.065-inch diameter round line or a 0.065- or 0.08-inch diameter twisted line. When restringing, you'll be using the same spool ...
Should you need to restring your weed eater, start by turning the nut at the bottom of the head clockwise and removing the cap. Take out the spool, insert a new line of string into the hole ...