if you boil the crab to just to kill it, maybe a minute or two, the meat is still translucent and easier to remove than in its raw state. here's a (crappy) pic from the last time i made crabs in which you can see the meat after a quick bath: the meat is closer to raw than cooked and would pass through a sieve fine. and i was able to get out whole leg pieces after wacking them with a cleaver, however the body took a little more work.