Does anyone have recommendations on how to hold this to turn down the OD? The bores are too small for the exterior jaws on the three/four jaw chucks. Should I just hope that there is a good bit of scrap when I get around to finishing this part and make mandrel for it?
What is it? If I were starting from scratch I’d turn the OD, bore the ID and then part it off.
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It is a spacer and it is a practice piece for doing boring operations.
I got a novelty iris shutter/fidget to go over the ignition button in my car. Problem is the back surface that glues on is slightly smaller than the bezel of that button. So instead of looking for a different one I figured I’d practice on the lathe.
That order of operations would have been a better idea but 2in bar stock doesn’t find its way into the drops section at Westbrook anywhere near as often as offcuts of 1/4in plate 
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I’ll check my personal drop pile today, I think I have a chunk of 2” 6061 round bar. If I can find it, it’s yours.
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I think Josh’s idea of starting from scratch is best. If you haven’t done parting before, be sure to check out some videos, such as Blondihack’s.
If you have to keep with the original piece, then yes, you’d need to make some sort of custom mandrel/holder to keep it in place securely.
I appreciate the offer, but I got the important features machined so I should probably figure this project finished enough and install it.