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The problem with using just any old 2mm (shouldn't that be 3mm?) washer is, you want the washer to only contact the inner race of the bearing. Otherwise, it will cause drag.
If you can find a washer the size of the non-flanged outer portion of the bearing, you can slighty increase the width between bearings, taking up the space. Basically, you'd want a washer that would only contact the outer race, and not touch the axle.
The other option would be to look at armature shims -- if you can find them in the right size, and they're small enough not to contact anything but the inner race, you're in business.
Its not an uncommon problem. The flipside, where the width is too wide, and the screw binds the bearings, also happens.
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