How To Remove Lens There Appears To Be A Hair In The Optical Path Canon Powershot A550

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There seems to be a small hair or thread in the optical path of my A550. I’ve partly dismantled it but can’t see where I need to go to clean between the lens and sensor.

@graham_fix use these guides Canon PowerShot A550 Repair to at least get into your camera. Here is the diagram of the complete optical unit