I have an slow shower drain. It is not a lever type drain or such. It is old-There is a pipe outside the tub and if working it should twist down to stop and up to drain. But the stopper is not attached to the pipe and has unscrewed and is stuck at the bottom of the pipe. I've tried to rethread the pipe no luck. trying to fish it out can't get anything long enough to snag it. Any suggestions. Thanks in advance.