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step 2: put booster into vice and clamp it with the 4 studs Inside and the main shaft pointing DOWN. don't squeeze the crap out of it, just enough to hold it in place and not move.
step 3: get a piece of square bar about 400-500mm long. drill 2 holes in it to slip over 2 diagonal opposing studs, make sure you've removed the little rubber seal and washer with a screwdriver and remove the shaft that goes into the master cylinder.
now use it as a massive breaker bar ad PUSH!!! will take a bit of muscle!! you need to rotate the top half until the little gaps line up and you can seperate the 2. THE 2 HALVES ARE SPRING LOADED. TAKE CARE SEPERATING!