I've been looking putting Skate wheels on a Brompton but one thing keeps sticking out in my mind. If the the Screws for the Wheels are 5mm and the 608 Bearings on the Roller blade wheels are 8mm then how do you close the gap? Is everyone just Ignoring the gap or is there something out there to fix this. I've Been looking under bearing sleeves or adapters and even a top hat, I only pulled up a few things.

First is another person who has the same question found at the bottom of this thread. (second post by makeinu)
http://www.bikeforums.net/showthread...+wheel+bearing

This is a person who did find a Sleeve a "Bronee" sleeve that I cant find anywhere. (tried to PM but I cant, don't have enough posts)
http://www.bikeforums.net/showthread...+wheel+bearing

And this website has Bearing Sleeves that i can but that im assuming will work.
http://simplybearings.co.uk/shop/adv...ds3=&x=23&y=15

Also I keep seeing people call it M6 screw is it 6mm or 5mm?