Help. I took out my bathtub stopper to clear out the drain. I had a frozen trap and had to vacuum out the water and allow it to thaw. I now cannot get it to set back in. I have a barrel stopper that sits on linkage and connects to a lever. For the life of me I cannot get it to fall down enough to work. I put a bottle brush and it goes down further then the stopper has to go. I have tried spraying it with cooking spray to lube it up but it still wont seat. Im all out of ideas. is there a gasket in there that could have been dislodged or something?