Several of my screws have fallen out of the back cover, a common problem with the Lenovo Ideapad. I purchased a replacement set of screws however, it did not come with any instructions, just a bag full of screws. I found the hardware maintenance manual however it just tells me that I will need five - M2 x L8.5 and four - M2 x L5.5 screws and no information is given as to which ones go where. It would normally have been an easy swap but because some of the screws are missing I don't have a reference.