Hmm, I did not have any issues with the diff. Built it as per manual, let it run in in an electric drill in both diretcions for a minute or so, and it was pretty good.
The slipper spring is just as it is on the Yokomo. Sure it does not look very pretty, but it works. I put a Kyosho spring washer on my Yoke that I had left after I converted my RT6 to an Avid slipper. Thank you for reminding me, I'll put it on the Firebolt!
