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we have some gears that are just riding on the shaft, hence just freespinning on it. while on the other hand we have gears that are attached to the shaft, moving the shaft as it spins.
we pin our gears to those shafts. to do so, you would need to drill a hole the size of the pin. the pins can be purchased from small parts. they're called spring pins, compression pins, etc.
hope this helps.
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