Kudos on trying to learn.
From the video it sounds like the heads are hitting the platter., and the lower head looks like it is damaged. I dont see any scratches on the top of the platter, so if you are on a learning adventure, try a head swap. It probably will not work, but it is worth a shot if you are learning.
I am by no means a professional, but I do believe in trying to help answer questions, instead of making comments that provide nothing.