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I replaced the screen several years ago after it dropped accidentally and broke. There were already 1-2 screws missing when I did the replacement. Over time, all the screws on the display side of the back cover and the middle one on the left worked their way out and now the back cover can open partially. I will use some loctite to replace the screws, but I need advice on what type of screws to buy for this? The laptop operates normally. Many thanks for your advice!

You can get the correct bottom case screws here for $1.99 https://www.ebay.com/itm/154812495049?_t