Originally Posted by MarkBrown

The TA03 ball diff is unusual compared to other ball diffs you may have worked on. The center screw is *not* used for adjustment. You must bottom the screw out, and use a little blue threadlock, to keep the diff together.

You adjust the diff by changing the diff lube. For a front-drive Mini, the Tamiya AW grease works well on many tracks. That's a fairly sticky grease so it slows down the diff action. On a front-drive car you do not want the diff action to be very free on most tracks.

I use a tiny bit of blue threadlock to keep the outdrives from floating around. If you use too much it can be hard to get the outdrives out when you need to, so go easy.

Putting in the ball diff should make your car easier to drive and more consistent, so keep checking/fixing until the car starts behaving.