I have a metal drain pipe with threads on the outside coming out of the wall behind a bathroom sink. The pipe that connected to this broke, so I need to replace the trap and find a way to connect to the drain pipe. The threads on the outside of the 1 1/2" drain pipe seem fine, but it only sticks out from the wall about a 1/4". What do I need to connect to the old metal drain pipe? Thanks for any help.