Finally got the old tub drain out. Went to thread new drain in, but it will only go 1/4 of the way. Same apparent diameter and depth of threading as the old drain sleeve, yet it won't go even with the drain wrench/dumbbell I bought. Tried wire brushing old drain threads, no help. Anyone run into this problem/have any ideas? Could the old 60's drain pipe have proprietary threading? Both parts are brass if that helps. I suppose my new drain could be too wide at the top so the bottom treads fine then it stops? If so it is not visibly apperent. I prefer not to rip out the bedroom closet wall (not that an access panel wouldn't be a good idea for the future) to replace the whole drain/overflow pipes, but I am running out of ideas .

I replaced my garbage disposal today. I took apart the connection between the far end of the p-trap and the pipe leading to the wall (thinking that the blockage I was experiencing was in the p-trap, but this turned out not to be true). I have reconnected everything and all seems well except water is leaking out of that connection. It appears to be two plastic or maybe metal pipes. One has an attached flange and there is a large nut that slips down over the whole connection. Do I need to put som plumbers putty somewhere? If so where? If not, what do I do to stop this leak? If possible, please reach me using instant messenger. I am "HawaiiThad" on most services. Or reply here. Any assistance is appreciated. Thanks, Thad