This is a hard one, not seeing how he reacts to different things. If I try
something and it didn't work I would try something different maybe, all depending
on how he reacts. You also don't state how long you have had him.
We started with pinkie by just letting him be, getting used to new place, he
was an angry lunging crabber that appeared to want to rip off our finger and
eat it whole.
After awhile we tempted him with dried mealworms on a SPOON, NOT our fingers
for fear of losing one. As time passed and he got the idea we are not the all
out enemy we could switch to carefully feeding him with mealworms in fingers,
but some gliders take time to learn they can carefully take the treat and do not
need to do the quick grab.
I don't like getting bit, so I do what is needed to NOT get bit.
I would try to pick him up with a fleece towel, give him a pet to try to show
him he's not in that much danger, then put him back in cage.
Once I was sure another glider would stay in sleeping pouch, I would take it out
of cage and sit with him and talk to him as he crabbed back at me. connor would crab less and less at me after awhile. But if your glider is going to run, this may not be the best way.
You could try a daytime bonding pouch, see if he will settle down and sleep with you in pouch.
You could try nighttime in a small room, bathroom or closet, give him something to explore (kids toys are good) see if he will hang out without attacking you, but this one sounds risky.