Hello I do not quite follow your story. but it seems your are repairing/restoring a bike that needs a hangar yes? there are lots of part places that sell them. 'loose screws' for one. what kind of derailluer are you trying to install?
most newer rear derailluers are rivited or swedged to the hanger. this is done strictly as a cost savings measure. some older models Hurrett and suntour had a few that bolted to the hanger but that defeats the purpose if you are trying to keep cost down.
http://www.loosescrews.com/index.cgi...d=213993527782
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk