Nice I was out there for a while, I used to ride bmx with a guy named Zed who was into dirt bikes as well.. he does the stayhi videos..
As far as the cases go its really not a big deal. You could pretty much see by eye where you would have to grind a little bit..as you look in from the out side of the cases you can see a bump and that bump is what prevents the lobe on the counter balance to pass through and fully seat the counter balance. I'll see if I can get a picture when I get home from work..