I got my new glider today.
and from your intro post:
I have one standard joey named Minnie and I am getting my second, Mickey, at the end of this week.
The real issue is not that he is a 'biter' but that he is quite frightened right now.
If he was previously housed with other gliders, he has lost his security that the colony of gliders will help him and come to his defense. He thinks he has been Kidnapped or Captured and feels very alone.
He does not know you. He does not know that you only want to love him and NOT EAT HIM.
Give him a few days to settle into your home and let him just chill out in his cage. Talk to him quietly when ever you are near by but hold off a few days on trying to hold or pet him.
He has a plethora of new sights, sounds and smells that are all unfamiliar and frightening to him.
Put a few pieces of fleece that you have either worn tucked in your clothes or slept with in your pillow case into his sleeping pouch to help him identify YOUR scent as a safe one.
Since you have 2 new gliders from different previous homes, be sure to WASH YOUR HANDS between handling the two gliders. They should be housed separately and introduced gradually. If you have already put them in the same cage, watch them closely for fighting. Part of his biting may be territorial - defending himself from a glider AND a human he does not know.
After he has time to calm down then begin interacting with him but go at his pace. He just needs time to begin to trust you.