We gave up on balls.
We read lots of reviews before purchasing. Decided that obviously adding balls would make it so much easier. Mistake number one. We ordered extra molding like most reviews suggested. We did four total and got the fourth right without the balls. It was nearly impossible to keep his member from touching the sides. The angle was the issue. We ended up laughing it off but I could see where people would get frustrated. We received the new silicone in our kit that sets up much quicker. Overall I would recommend trying it! However be ready to try again,again & maybe just one more time.