Hi guys this is my first post but I am not a newbie to bike mechanics and repairs.
Im putting an old hybrid back together. It cannot have a conventional drop-out it needs something more like a Shimano RD-tz50 - http://imp-rowery.pl/img/allegro/shimano_rd_tz50_h.jpg its the part that attaches to the frame that is causing me problems, I can't find a technical name for it or another derailleur that attaches to the frame like this. The rd-tz-50 is as basic as it gets, I'd rather something of higher quality. Any ideas of its actual name or if you can get an adapter kit or if there are other derailleurs out there with this type of attachment?