I have also heard of dremelling the base, then cracking the head. Leave the flesh connected, and it will receed, and seperate.
Or you can do what I did, with was while in the process of removing some of the base, ie horizontally, the hammer split vertically in 3 pieces. 2 pieces fell to the floor, with me holding 1 piece, with a big 'o-crap' look on my face.
Put all three pieces back into the tank, and they have all recovered.
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