Frustrating! Ang, Matt from the other KFL thread had someone do a hot-cold-hot-cold-hot-cold sequence. Maybe get some water boiling and also a bowl of ice water Dunk it in one for 20 seconds then the other for 20 seconds and repeat for a few cycles. That shrink/expand action should loosen it up. Just don't dunk anything non metallic. I'm assuming the parts that are stuck are all metal?
There's an o-ring in the middle...
R