I did the 8mm mod "properly" last week, by using the carbon c-hubs. I used the long rear turnbuckles instead of shortening them (effectively putting the turnbuckle over the outer hole) and I love it. The rear is a little more loose, but well controllable.. I can kick out the rear when I want to slide through turns, and catch it as soon as I need to. I only use 5mm on the inside, though.