Black string

The racket black paint came of easily I don't know why, the ball was small but that's fine but it did looked used I saw a stain on it but the problem is the net no warning signs about the black string on the net how am I supposed to even it out if it's stuck deep inside it's pretty much useless now right? I checked on YouTube if I can fix it no video I can find, the instructions were not very good no pictures be careful with this problem now I need to find to a way to fix this if anyone can help me let me know

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