part of la torre 12000 series cartridge is stuck ?

My la torre 12001single lever bathroom sink faucet needed a new cartridge which I have.So, as per instruction on youtube, removed the parts to expose the old cartridge, then tried to lift it out. Was totally stuck, until it came only partly out! Now I cannot get the bottom part out. It broke in two pieces when trying to lift it. HOW do I remove the last bit, it is really stuck!