I have for sale a mini lathe adapter 4" will fit a 4" 3 jaw or 4" 4jaw. $10+ shipping
http://www.littlemachineshop.com/products/product_view.php?ProductID=1692&category=-1110836144
http://www.littlemachineshop.com/products/product_view.php?ProductID=1692&category=-1110836144