I haven't, all I've got is one with a dropout fitting (or whatever its called), i.e. doesn't mount directly into the frame. There is maybe just enough room to fit a specially shaped washer in between the frame hanger and the derailleur so I will make something like this and see if it helps:
I haven't, all I've got is one with a dropout fitting (or whatever its called), i.e. doesn't mount directly into the frame. There is maybe just enough room to fit a specially shaped washer in between the frame hanger and the derailleur so I will make something like this and see if it helps: