Then you need to do it with a stick to start out with, and don't do it with him inside the cage, let him come out and then try it. When you can get him to step up onto the stick, move your hand further up on the stick until it is right up against him. Of course you need to not flinch or pull back when he does bite, it will make him bite more, he will associate pulling back with getting you to leave him alone and that is not what you want to accomplish. To him it will be a game and you need to show him you are not afraid of him and it will result in a few bites but in the long run he will understand you are the boss and he must do as you ask. It doesn't mean you have to be mean to him but firm and speak softly to him, save the harsh voice for another time.
These are my suggestions, and some of the members may disagree with me but this is my opinion and if others differ then they can post their ideas and opinions.