1mtx1- I know you said you'd definitely will look into the issue with the ball, so I don't mean to hound you on this and pleae don't take this the wrong way- but it's very important. We all know how fast our glider babies can run on the wheel in the cage, so image how they're going to be in the ball. The second they realize their finger or toes are caught, they have already flipped and rolled 2 or 3 times. Unfortunately during that split second they can break their toes, hands, or even arm. To my knowledge, when that happens, the area usually as to be amputated.
I know first hand about amputations with sugar gliders. My Molly had to have her ENTIRE tail amputated.We don't know the cause to this day, but the most probable cause (according to several reliable, experienced sources) believes she may have broken it while playing. Last I know they don't "reset" glider's bones. If you ignore a broken bone the area will become "dead", will become infected, and spread up the limb.
Her tail amputation:
So please, please be careful with the ball and for any other toys for that fact. The day you realize something is seriously wrong with your baby, it just breaks your heart. I understand it is your choice whether or not to use it, just please be careful... and enjoy your gliders! Sounds like you're spoiling them rotten