I can’t get my ball back on 😩

Me

Ok guys. I decided to change my rook piercing today (my fiancé usually helps me) and I got it in fine, but I can’t get the ball back on! I first inserted it from the top but realized I couldn’t screw the ball on from the bottom, so I took it out and swapped it and put it in from bottom up. But, I can’t get the ball started even though I can see or better now. Does anyone have tips to get the ball started back??