It looks like the pin guide came off the tube and is stuck in the neck socket. Can you gently remove it? Maybe it's intact and it's just the sealant that was holding it to the tube that gave way. If not, then you'll want to find/make a new one.
Here is the one I printed from Thingiverse for a CR-23 (fat neck) next to a 19" K7000 with a CR-31 skinny neck. They look similar but the 3D printed one is absolutely too big for that tube neck. It will fit a 25" (what I printed it for) or a fat neck 19".
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