Where did you find the magnet?

Some suggestions on where to easily source a replacement would be a big help to some people too.

My idea is to go to any general store/hardware store and purchase one of those rubberized fridge magnets and cut a small enough piece off with a sharp craft knife, then just fashion it to shape and size.

Just noticed this is already mentioned earlier in the thread

In a similar vein. Whenever I've been giving my 900 a bit of a clean and brushed my finger over the recess near the camera lens the handset has buzzed, as if the lens cover has been opened, so I think the camera relies on both the optical and magnetic sensors working.