Yes both can be done.
For the shaft, you would need to bore, plug, and retap to your preferred thread.
For the butt, you would need to remove the existing pin. You can do this by heating up the pin until the glue melts and backing it out or drill/bore it out. You would also need to plug up the existing hole and install the new pin.
Obviously the shaft is much much easier, however both are possible.
Phil
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