I've found a few tutorials online and searched here, but the mechanism on my sink seems to be different from others I've found tutorials for. Here's the general apparatus (credit to this question):
The issue I'm having is where the pivot rod goes into the pipe under the sink. I need to remove the pivot rod in order to get the stopper out, but I can't figure out how to do that. Here's a picture of what it looks like:
There are 2 "slots" across from each other, but I can't fit anything into both because the pivot rod itself is between them. How can I get the pivot rod out of the pipe so I can remove the stopper?