I used the syphon method and it worked. I got some 1inch clear vynal hose and positioned the rock were I could make a 90 degree curve in the tubing. Then I put a couple pieces of pellet food in the tube a few inches from the end... when he tried to grab the food, I sucked on the tube and bingo he was in a bucket. I tried a few traps with no luck, and I could not dip my LR because he setup shop in a huge 25lb piece of rock.
Starving him for a couple days may help if he is shy. And it will take some zen like patience.. but for me it worked.