I have an old tub with a standing waste stopper. When the drain is closed, if the water level gets too high, it automatically drains down to a fixed level. That level was 3/4 of the tub depth, until the building maintenance man did something to the standing waste mechanism--he doesn't know what--and it now drains to about a third of the tub depth. In order to take a bath, I have to use a rubber disk over the drain. Very frustrating.
Anyone know what he might have done to make this happen? If so, what can I do to restore it to the previous level? Thanks.