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Either pop the wheel on a lathe and bore it out to the desired dimension and press the bearing in or pop it under a pillar drill and drill it slightly undersized, heat the bearing and press it in. The heat will cause the plastic to melt out the way.
Size wise for a featherweight axle 10mm diameter will do happily. Bearing in mind that drill gearbox shafts are around the 8mm mark.
I'm having trouble finding a 12v LED and I'm looking for a suitable axles, for my bosch 35w motors.
just buy a regular led and put a resistor on it :)
http://www.technobotsonline.com/opto-el ... ators.html
A range of 12V and 24V LEDs in red, green and yellow.
Axles for the Bosch 35s may have to be a custom job.
i think although not 100% sure but
something like a 4mm allan key will fit nicely into those motors
not sure its 4mm though worth a try as its cheap
I use 4mm keyway steel, fits perfectly. Available from any engineering shop, probably on ebay and RS.
See here for one way of doing it http://www.teamstorm.com/feathers/forcex.htm (at the bottom)