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[* black] With the image sensor plate removed, three tiny springs will be seen in the lens back plate. These are very easily lost. Remove them with fine tweezers and put them somewhere safe.
-[* black] A very thin coated glass window will fall out if the lens is inverted. On no account touch it with your fingers. It may be cleaned if necessary, however this is unlikely as the rear face is sealed from dust except during disassembly and the front face is normally protected by the focussing lens in its rest position.
+[* black] A very thin coated glass infrared filter will fall out if the lens is inverted. On no account touch it with your fingers. It may be cleaned if necessary, however this is unlikely as the rear face is sealed from dust except during disassembly and the front face is normally protected by the focussing lens in its rest position.
[* black] The image sensor itself should not need cleaning unless contaminated while disassembled. Should it be necessary, first peel off the rubber surround. On reassembly, do not attempt to reattach this to the image sensor plate but rather place it over and around the glass window.