Down Stem Stuck in Bong

My fitted glass down stem is, seemingly, permanently stuck in my bong.

I've tried using hot water, like the pickle jar trick.

I've completely cleaned it 3 times since this became a problem, i was hoping the alcohol would dissolve any sticky stuff causing the jam.

I've tried using all sorts of grippy kitchen gadgets.

My last resort is to use tools like an adjustable wrench, or some pliers, but I'm worried I'm going to break something.

Anyone else run into this problem?

Anyone have any solutions or suggestions??