Moog lower ball joint question. Need Help

[novice]

I have new Moog ball joints. I pressed the lower one in my factor control arm with no issue. My question is about the rubber grease seal. The directions are not very clear for me. I was wondering if the rubber seal slid over the larger portion of the ball joint shaft or if it just butts up to the shoulder. It seems to small to slide over the shoulder. I'm wondering if it just butts up to the shoulder and the installation of the spindle keeps pressure against it so grease doesn't just come out. Any help is greatly appreciated.