I have been using 3 bearings for years. 
http://www.oople.com/forums/showthread.php?t=108680
I forgot to mention that I have to remove some plastic so that the middle ball bearing can be pressed through the gearbox, then nothing will bind
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DEX 210, 410 and 410Ultra
Kyosho Lazer FS2 SP
Ultima RB5 SP2 WE and Vega SP2
Ultima SC-R and DESC 410R
BOMBK
Norway
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