You might give it a try but take care to see if the end servings and center serving for the idler are in the correct positions and long enough to protect the strands of the string from the cam and idler. You don't want too many twists in the string. Depending on the exact build length of your friend's string, it might be very close, or far from, exactly 90 1/8 inches. I'd personally opt for the best you could afford for a spare/replacement string and cable. I build my own for my bows and it's fun and rewarding. Look into string making to enhance your archery hobby, you might just discover that you have more friends than you thought