For a very long time, I've been using Pledge Floor Care to add friction to loose ball joints in toys. More recently, I've decided to try out using moldable plastic. It's a lot faster and more effective than Pledge Floor Care in my opinion. With Pledge, you have to wait a few hours before the joint tightens up and if you didn't apply enough Pledge, you'd have to do it again. With moldable plastic, you can immediately get results and if you need more, you can easily heat up more plastic and add it to the joint. Here's how I do it, I hope someone finds it useful if you ever have to deal with loose joints
OneSixthFigures