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If it looked like this before it might have just been the cover?
http://www.decathlon.co.uk/sunrace-5-s-rear-derailleur-id_8072338.html
The way I was thinking was this style hanger going on first with the other bit bolted into it.
http://www.decathlon.co.uk/universal-rear-mech-hanger-id_8329146.html
http://www.decathlon.co.uk/3-7s-short-rear-derailleur-id_8075892.html
The dérailleur just sits on it, I remember it had a spring but she lost it, I don't know what was holding it in place though.