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ok so after carefully reaming out the holes and ditching the full sized hammer for a watch hammer, i was able to mostly hand press the parts into place with some MINOR coercion from a small hammer. i think walloping on those tiny bearings with a claw hammer may have been a bad idea from the get. Im going to post more above. i also punched the 4mm rod into and out of the gear on the outside of the cage like 3-4 times forcing it at more of a proper/square angle