For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
You did not over tighten the screw, you used a screw that was too long, that's how this happens. The fan has 3 different screws, a long one(middle), one with a big head(IO board) and a short one(board side).