RIBCAGE: YI 4K INSTALLATION GUIDEwww.back-bone.ca | support@back-bone.ca91-8 Detach the Main BoardRemove the main board mounting screws on the lower left and upper right again making sure to savethe screws (SCREW TYPE ‘B’). Lift up and out to separate the board from the aluminum plate.1-9 Remove the Lens assemblyRemove the three screws holding the lens assembly onto the aluminum plate and put them aside(SCREW TYPE ‘D’). Pull the lens assembly free. We’ll outline how to prepare the lens for use in yourmodified camera later in the document. The disassembly is now complete!