It was actually a lot easier than I thought it would be. I held the outdrive on my bench with pliers and used my hand drill with the grinding bits. I did go through 2 grinding bits to do all 4 outdrives but they're pretty cheap so not a big deal. I also ground down the overall length of the outdrive, the bones are nowhere near falling out at full droop so it's completely safe.

Don't know the weight distribution but I would think it's pretty close to 50/50. I couldn't believe how light it was when I threw it on the scale though, this is my first R/C car to be underweight. I plan on picking up 4 little scales at Harbor Freight sometime this week so I'll know the distribution pretty soon.