[54vicky]

here are a couple of pictures of the tool you need.one is a picture of one of the wrenches placed on a ford bleeder on a mounted wheel cylinder I have.it is a 3/8" the others are pictures of a swivel headed wrench but you should be able to use the one I show on the bleeder.if you spray PB Blaster or similar on it and let it sit as Jeff suggested it may also help if you do not want to use heat and ice.you can if really stuck use something as a lever on wrench such as a small piece of tubing that will still allow the wrench to fit snug on bleeder.just be aware if a lot of pressure on bleeder is still required let it sit a little longer as you can still strip the bleeder if using to much force.also if the wrench is not a good quality one it will spread the jaws that fit on bleeder.