I have a 50 year old home. Under the kitchen sink there is a 1.25" pipe that is stubbed out about 2" or so for the drain connection. It has a flange around the pipe at the wall. The flange looks to be made of lead and appears to a part of the pipe. The pipe has now rusted away on the bottom portion of the pipe. The top half of the pipe is still solid but the pipe wall thins as the pipe wall nears the rusted out portion. Unfortunated, the portion missing is all the way back to the flange so there is not enough "stub" all the way around to attach to. I know this is not uncommon on older homes but have never seen one fixed. What are the options on repair? Thanks in advance.