Hey, this is my first post here, hoping this is sort of in the right section because I use it on my TC4.
I'm guessing you may have heard of this tip but I'll share it anyways because it's so simple and has made a big difference in my cars. I searched on forums and no one seems to be doing this.
I was trying to figure out how to eliminate the slop in ball cup joints on my Associated cars, and I figured out that you can use super glue. The secret is that you have to apply a very light coating of grease to both the ball and inside of the ball cup. The best way is to use a q-tip with a little grease on it and stuff it into the ball cup, then use the q-tip to lightly coat the ball with grease.
Then lightly coat the ball with super glue and quickly pop the ball into the cup. Do not put glue into the ball cup because too much glue will get trapped inside and seize things up. Don't touch it for 15 minutes or so to let it dry. Then you can break it loose and voila, it moves very freely with NO slop! And it lasts for a long time too. When a bit of play develops again, just repeat the process.
My nitro TC3 and TC4 now have NO steering play at all! And it has lasted for a long time and several crashes.
Hope this helps!