ok I have 65 mm front and 100.5 rear
the rear if pushed to one cup has pin in the middle of the other cup
the front if pushed is 3/4 in the other cup
so the rear has bit more play but works without any problems
- did have some fun at work in underground parking. (video
http://www.radeks.net/?p=66)
was running quite hard and even chassis around quark heatsink was warm :) so cooling works even without fan
got 15 minutes of runtime from IB4200 charged in the morning