Hey Sean, I've never had to catch one yet but here is what I have read about catching a crab. Cut the top of a pop bottle out like you were going to use it as a funnel, invert it into the remaining portion of the bottle put some bait in there and set it up so he can get in. The other one I heard about is using a glass jar, prop it up on a rock (about 45 degrees) put some bait in and that should do it. He won't be able to climb up the glass. Hope that helps, let us know how you make out.
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