I'm trying to unblock a shower drain. However the drain snake won't go far in, it hits solid bottom. I suspect the design is as in the diagram below, and will need to remove the second metal piece (I've already removed the cap) to be able to get the snake into the drain (right).
How can I remove it? It's inset to the shower, so I can't get any force on it. Is there a smart way to grip it from the inside?