I would first try cold. In the deep freeze overnight and then some well placed taps with a heavy rubber mallet ...
If that doesn't work and you have a mechanical lock, then try heat. I have had success by using an iron at full heat placed on top of some kind of steel bases/ rings that have a good flat spot, and allowed to slowly heat everything up. It might take a while but if you can get all of the epoxy that is touching metal softened up enough, she might come out.
Tapped pillars ... That's a new one for me but that ain't saying much.
