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Unimat 3 vs DB/SL Lathe 3-Jaw Chuck?


 

I have a 3-Jaw chuck that looks like those for the DB/SL with the three screws holding on the M12 threaded backplate, but the backplate is threaded M14 to fit the Unimat 3. Did Emco use the same 3-jaw chuck for both the DB/SL and Unimat 3 for a time? The 3-jaw chuck that is specific to the Unimat 3 (and diagramed in the owner manual) does not have a removeable backplate, so just wondering how I happened to have something different.
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Also, are there replacement jaws for these chucks as I have just sheared the teeth off one of the jaws in my chuck.
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Thank you,
Timothy Jump