Learn something new every day. That would make sense about the nylon gears. Once NWSL gets back on their feet, I may just order a spare delrin gear from them so I don't have to keep opening the gearbox up. With a 2 mm bore and only a 6 mm face size, its a very small gear. That does not leave a lot of material to handle the stress of being press fit on the axle, coupled with what you stated above.
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