After triple checking your husbandry and making sure all the points are sharpened and your ready to feed him. Try scenting the thawed warmed rat fuzzy with a thawed or live mouse. Keeping the rat fuzzy very low or close to the floor of the enclosure slowly and steadily inch the fuzzy towards the the snake. No dangling, shaking or fast movements as you go forward. Oh, try to do this with the lights off or at nighttime.