Wear gloves!
Seriously. Has he actually bitten or does he just act like he's going to?
I would just make very very sure that he has daily handling and set aside 15 minutes to devote entirely to pebbles and make sure it's a positive experience.
Yeah, wear gloves, let him bite. Eventually he'll see that you aren't evil and he'll get over. But you definitely don't want him to think that biting gets him out of being handled.
If this is only happening to you... pay very careful attention to what others may be doing differently. Make sure you aren't wearing perfume/cologne/smelly lotion, etc when you go to handle. Make sure you are scooping Pebbles up from under his belly rather than coming down from above.
Does he still try to bite after you get him out of his cage?