You might also be interested in these lathe chuck back plate.
Buyohlic Small Chucks for 3" I 80 mm & 4" Inch I 100 mm Rotary tables with Steel Back Plates and Mini Lathes (65 mm 4 jaws self centering chuck M14 x 1)
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63mm, 3 Jaws K01 63 Self Centering Lathe Chuck, Self Centering Lathe Chuck with Back Plate for Wood Working
The chuck is made for meter machine tools in the processing of non-ferrous metals non-metals like plastic and so on.