Quote Originally Posted by John S View Post
In the smaller sizes they are known as magneto bearings, Arc keeps them, ask for E8's
Hmm, I even looked there... must be blind:

http://www.arceurotrade.co.uk/Catalo...-Ball-Bearings

Quote Originally Posted by njhussey View Post
Still got to work out how to shield them.......
Aluminium disk or whatever with only a very very small clearence - enough to stop it touching, but not so big that it lets lots of dust in. I believe the term is aluminium labyrinth. Any seal which touches is going to generate a lot of heat due to friction.