@galestorming not quite sure which hex key you are referring to or what is wrong with it. Check the disassembly manual on here ==>[document|2845]. It looks like you are looking at the ASSY CASE TOP part number BU03065-100. Post some images of what exactly needs to be prepared with your question. It will allow us to see what you see. For that use [guide|21499|this guide]
[image|1027169]