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I've modified a couple of 20D's.
There is a black metal frame that screws onto a plate and the sensor is held down with that. The whole unit though is screwed onto body framework as I recall. There probably are photos of the 10D or 350D modification process. The sensor unit hadn't changed much in the first few models. Later on they added the dust remover.
Have a look at those photos.
To get to that point though you have to remove several layers of copper shielding and some ribbon cables.
If it has moved and is not simply sagging in your focuser or your focuser is sagging then you could pack out the offending edge. Working out which corner it is may be tricky.
In your image it is the bottom right. But does that reverse with the camera sensor? Like upside down and reversed like a view through a refractor without a diagonal.
Greg.
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