more info on what you did, looks like you took and old cast iron weight and not sure how you attached it to your lathe
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Sorry about the lack of info. Yes it is a 10lb cast iron weight that someone discarded. I ground the letters off and turned it straight in my brake lathe. The hole was too small for my 6" 3jaw so I reference marked it for the chuck jaw holes. Drill press got me 3 holes for the chuck jaw to fit snug. I put it in the 3 jaw as shown and bored center, turned face and outer edge. I put reference lines on it to help center(rough) odd parts and such. I marked it to #1 jaw and can remove it and replace it as needed without much work truing. Then I flipped it and cleaned up the back edges. I needed it because I didn't have a 4 jaw but one became available and I didn't use it. This will probably be used as a drive plate now, but it could get holes drilled and tapped for parts and clamps. I will use it when the necessity bug bites me.
I hope this clears up the questions and helps if someone needs one. This is not intended for heavy work, but a dedicated back plate could change that.
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