[morzh]

I snipped the wires that go through the eyelets, and pulled the can off, without having to disconnect the terminal panel from the rest of the chassis.
Then I used two heatguns, having positioned the can over some foil; I forgot what I used as props for it. Anything will do.
Then I used corkscrew, large flat screwdrivers and such to pry the innards out. At some point the outer part of the tar block was no longer pushed against the walls of the can, and it separated, and then I was able to pull it out.