I am looking to replace the 1 1/2" tub drain body which is a FINE THREAD and not a coarse thread like I have been finding in the stores. Is there a brand that makes a fine thread 1 1/2" piece? My other components are Sterling/Rockwell but I am not sure about the drain. I do not want to replace the underneath shoe because it is in a peculiar place. If I do need to replace the shoe I definitely want to tie it in to the existing 1 1/2" overflow pipe extension. I have not seen a brass shoe that is as large as the one I have now. Can anyone help with suggestions?