Sike had the same issue with his inner bearing on the rear diff of his revo when using the spiral cut gears. I suggested making a spacer that would fit between the 2 bearings, and distibute the load onto both bearings. Basically it would allow you to clamp the bearings between the pinion and the drive cup, and it would be impossible to push the center out of the bearing. Just a thought...
Good idea. I will do that as soon I can get some more bearings.
I picked up a FlyCamOne the other day and tried it out. I mounted it in my E-revo and ripped around my yard. The camera slipped a little half way through and you can see the rockers doing their thing, looks pretty neat. The donuts can make a person sick though.