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You could use a lathe to remove some material, then polish it out again.
I'd recommend buying a similar chunk from TAP or a similar vendor and experimenting.
One option might be to rig something to hold it on each end, and gently twist it while heating it, which should give you the effect you're looking for. TAP (and others) sell special heating element strips specifically for forming this stuff.
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"You go to the track with the Porsche you have, not the Porsche you wish you had."
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