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I find that a pair of vice grips often does the job.
Way back in the early days of disk memory they used aluminum disks with painted magnetic material on them. This had it's limits, and they started to use deposited films on the aluminum. But, the old way of lapping the disk down to make them smooth enough wasn't good enough. They started to use a diamond bit in the machining process, and completely eliminated the lapping process. The diamond turning gave a smoother finish. All of the finishes were 'mirror' like, but the requirements for the disks were much better than a mere mirror finish.
It looks like about 20,000 watts input to produce 1 watt output!