Join Date: Jun 2005
Bikes: Raleigh, Rudge, James 3spds., and a cast of many
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I'll bet that it's a one-piece crank. I figure you'll have to take the pedal off the left side (side with no toothed chainring), take off the nut and washer you've already removed, then look for a slot or notch underneath them. This will be a tapered and threaded bearing cone that you remove by tapping against the notch/slot with a punch and hammer, or failing that, your least favorite screwdriver and a rock. It unscrews the same way as the nut you've already removed...I'm guessing clockwise.
If I'm right, everything should just fall out of the righthand side when you're done. Please let us know what happens, or if you need more tips.