HELP ASAP!!!! 1991 mr2 lose bolt and i dont know what its is (VIdeo link available) [Archive] - Toyota MR2 Message Board

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Ive been have an annoying belt noise so i decided to take a closer look today, i found a long bolt lose and i was able to shake it. There is a zip tie there but i dont know was purpose it serves. Please take a look, link below. If you you could also tell me if that scratching sound is normal, id appreciate it guys https://www.youtube.com/watch?v=dMfxXp940OA