This is probably a dumb question (I am really good at those!)

I am trying to move dynamotor shock mounts from a junker chassis to a good one.  I figured out that the top part unscrews. I expected the bottom to just drop out at that point. When it didn't I applied a little force and it still didn't budge.

Are these just a press fit? Before I apply more force I want to make sure there's not something I'm missing.

Thanks,

de Robert W7MKA