We have a bathtub that has a push pull drain stopper, and I need to clean out some gunk. The problem is that I can't get the stopper out of the drain. I (finally) got the top knob removed, and I read that there could be a screw to loosen. Unfortunately, there is no screw, and when I raise and lower the stopper, whatever the stopper is attached to also raises and lowers. The stopper raises only enough to barely slip a pair of needle-nose pliers underneath the stopper and feel the shaft in the middle, so I can't see what's underneath.
It seems that most of the videos I can find are for lift-and-turn stoppers, and the videos for a push-pull stopper have a screw to loosen under the knob. Any suggestions?
The hole has a diameter of approx. 1/4", and the depth from the top edge of the stopper to the center is about 3/8".