To help the ball rotate freely, some choose to inject a plastic filler or set in a Teflon liner. Misalignment spacers are commonly used to center the joint so it can achieve the most degrees of ...

The Able Spacer (Photo by Photofusion) Universal Images Group via Getty Images. Simple spacers can be made with plastic bottles, Styrofoam cups, plastic baggies, paper, or even toilet paper rolls.