Adding to my waxing comment, never wax body gripping traps or "conibear" style killer traps. The wax makes them too slick to stay set and the bigger ones like the 330's can be very dangerous if waxed. If you happen to buy body gripping traps used that have been waxed, be sure to boil the wax completely off of them. Also, take a chain saw file and file the notch of the "dog" of the body gripper. When I set them I set the dog right on the jaw of the body gripper to get the trap positioned correctly. When I think it will set in the water or whatever correctly and stable, I then engage the dog with the trigger of the body gripper. 330's can be a bear so you need trap setters and also a safety clip.