another method I have used is to put the hand wheel on the machine, loosen the lock so that it is only spinning the handwheel (like you were about to wind a bobbin) have someone treadle while you use the machine like a lathe to spin it and do the polishing using your tool of choice
(I usually just take it to work, put in on an aluminum shaft I made for the purpose, and polish it on the lathe. I just assumed you did not have access to that)
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