Just a tip for the next diff rebuild, I have been using the Associated TC3 diff rebuild kit on my Pro 2's. It comes with a hex bolt which is handy vs the flat blade screw, and thrust washers, diff rings etc. It all fits great. The diff rings VERY close to the HPI ones in diameter (which are discontinued by the way) I just rebuilt mine with ceramic diff balls, it's the smoothest I've ever felt a HPI diff.
Weather is warming up, get ready to play!